Hello I found a bug in latest upstream tree titled "KASAN: slab-use-after-free Read in v4l2_fh_open" and aslo titled "KASAN: slab-use-after-free Read in em28xx_release_resources”. I believe both of them are the same bug, and I found the bugs with the same name reported by syzbot: https://syzkaller.appspot.com/bug?extid=b2391895514ed9ef4a8e and https://syzkaller.appspot.com/bug?extid=99d6c66dbbc484f50e1c, and I believe this not the same bug. If you fix this issue, please add the following tag to the commit: Reported-by: xingwei lee <xrivendell7@xxxxxxxxx> kernel: lastest 5ad3cb0ed525b80c7f66c32b49a68c1f3510bec9 kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=4a65fa9f077ead01 with KMSAN enabled compiler: gcc (GCC) 12.2.0 ================================================================== BUG: KASAN: slab-use-after-free in v4l2_fh_init+0x278/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25 Read of size 8 at addr ffff888053f9a738 by task v4l_id/21260 CPU: 0 PID: 21260 Comm: v4l_id Not tainted 6.8.0-rc6-00238-g5ad3cb0ed525 #17 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-1.fc38 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x5c/0xb0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 v4l2_fh_init+0x278/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25 v4l2_fh_open+0x7c/0xb0 drivers/media/v4l2-core/v4l2-fh.c:63 em28xx_v4l2_open+0x1ea/0x6a0 drivers/media/usb/em28xx/em28xx-video.c:2155 v4l2_open+0x1ed/0x400 drivers/media/v4l2-core/v4l2-dev.c:427 chrdev_open+0x215/0x610 fs/char_dev.c:414 do_dentry_open+0x5da/0x14f0 fs/open.c:953 do_open fs/namei.c:3645 [inline] path_openat+0x1983/0x2740 fs/namei.c:3802 do_filp_open+0x1bc/0x400 fs/namei.c:3829 do_sys_openat2+0x12c/0x170 fs/open.c:1404 do_sys_open fs/open.c:1419 [inline] __do_sys_openat fs/open.c:1435 [inline] __se_sys_openat fs/open.c:1430 [inline] __x64_sys_openat+0x134/0x1d0 fs/open.c:1430 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x78/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f30564a0e01 Code: 75 57 89 f0 25 00 00 41 00 3d 00 00 41 00 74 49 80 3d ea 27 0e 00 00 74 6d 89 da 48 89 ee bf 9c ff ff ff b5 RSP: 002b:00007ffffe493a00 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f30564a0e01 RDX: 0000000000000000 RSI: 00007ffffe493f05 RDI: 00000000ffffff9c RBP: 00007ffffe493f05 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 00007ffffe493c30 R14: 0000560ca266fbf8 R15: 00007f30565c1020 </TASK> Allocated by task 15533: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:387 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] em28xx_v4l2_init+0xe6/0x3b00 drivers/media/usb/em28xx/em28xx-video.c:2534 em28xx_init_extension+0x10a/0x1c0 drivers/media/usb/em28xx/em28xx-core.c:1116 process_one_work+0x789/0x12a0 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x6fb/0x1170 kernel/workqueue.c:2787 kthread+0x2ed/0x3d0 kernel/kthread.c:388 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:243 Freed by task 15533: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:589 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x124/0x360 mm/slub.c:4409 em28xx_free_v4l2 drivers/media/usb/em28xx/em28xx-video.c:2120 [inline] kref_put include/linux/kref.h:65 [inline] em28xx_v4l2_init+0x1d6c/0x3b00 drivers/media/usb/em28xx/em28xx-video.c:2903 em28xx_init_extension+0x10a/0x1c0 drivers/media/usb/em28xx/em28xx-core.c:1116 process_one_work+0x789/0x12a0 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x6fb/0x1170 kernel/workqueue.c:2787 kthread+0x2ed/0x3d0 kernel/kthread.c:388 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:243 =* repro.c =* #define _GNU_SOURCE #include <dirent.h> #include <endian.h> #include <errno.h> #include <fcntl.h> #include <signal.h> #include <stdarg.h> #include <stdbool.h> #include <stddef.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/mount.h> #include <sys/prctl.h> #include <sys/stat.h> #include <sys/syscall.h> #include <sys/types.h> #include <sys/wait.h> #include <time.h> #include <unistd.h> #include <linux/usb/ch9.h> static unsigned long long procid; static void sleep_ms(uint64_t ms) { usleep(ms * 1000); } static uint64_t current_time_ms(void) { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) exit(1); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } static bool write_file(const char* file, const char* what, ...) { char buf[1024]; va_list args; va_start(args, what); vsnprintf(buf, sizeof(buf), what, args); va_end(args); buf[sizeof(buf) - 1] = 0; int len = strlen(buf); int fd = open(file, O_WRONLY | O_CLOEXEC); if (fd == -1) return false; if (write(fd, buf, len) != len) { int err = errno; close(fd); errno = err; return false; } close(fd); return true; } #define MAX_FDS 30 #define USB_MAX_IFACE_NUM 4 #define USB_MAX_EP_NUM 32 #define USB_MAX_FDS 6 struct usb_endpoint_index { struct usb_endpoint_descriptor desc; int handle; }; struct usb_iface_index { struct usb_interface_descriptor* iface; uint8_t bInterfaceNumber; uint8_t bAlternateSetting; uint8_t bInterfaceClass; struct usb_endpoint_index eps[USB_MAX_EP_NUM]; int eps_num; }; struct usb_device_index { struct usb_device_descriptor* dev; struct usb_config_descriptor* config; uint8_t bDeviceClass; uint8_t bMaxPower; int config_length; struct usb_iface_index ifaces[USB_MAX_IFACE_NUM]; int ifaces_num; int iface_cur; }; struct usb_info { int fd; struct usb_device_index index; }; static struct usb_info usb_devices[USB_MAX_FDS]; static struct usb_device_index* lookup_usb_index(int fd) { for (int i = 0; i < USB_MAX_FDS; i++) { if (__atomic_load_n(&usb_devices[i].fd, __ATOMIC_ACQUIRE) == fd) return &usb_devices[i].index; } return NULL; } static int usb_devices_num; static bool parse_usb_descriptor(const char* buffer, size_t length, struct usb_device_index* index) { if (length < sizeof(*index->dev) + sizeof(*index->config)) return false; memset(index, 0, sizeof(*index)); index->dev = (struct usb_device_descriptor*)buffer; index->config = (struct usb_config_descriptor*)(buffer + sizeof(*index->dev)); index->bDeviceClass = index->dev->bDeviceClass; index->bMaxPower = index->config->bMaxPower; index->config_length = length - sizeof(*index->dev); index->iface_cur = -1; size_t offset = 0; while (true) { if (offset + 1 >= length) break; uint8_t desc_length = buffer[offset]; uint8_t desc_type = buffer[offset + 1]; if (desc_length <= 2) break; if (offset + desc_length > length) break; if (desc_type == USB_DT_INTERFACE && index->ifaces_num < USB_MAX_IFACE_NUM) { struct usb_interface_descriptor* iface = (struct usb_interface_descriptor*)(buffer + offset); index->ifaces[index->ifaces_num].iface = iface; index->ifaces[index->ifaces_num].bInterfaceNumber = iface->bInterfaceNumber; index->ifaces[index->ifaces_num].bAlternateSetting = iface->bAlternateSetting; index->ifaces[index->ifaces_num].bInterfaceClass = iface->bInterfaceClass; index->ifaces_num++; } if (desc_type == USB_DT_ENDPOINT && index->ifaces_num > 0) { struct usb_iface_index* iface = &index->ifaces[index->ifaces_num - 1]; if (iface->eps_num < USB_MAX_EP_NUM) { memcpy(&iface->eps[iface->eps_num].desc, buffer + offset, sizeof(iface->eps[iface->eps_num].desc)); iface->eps_num++; } } offset += desc_length; } return true; } static struct usb_device_index* add_usb_index(int fd, const char* dev, size_t dev_len) { int i = __atomic_fetch_add(&usb_devices_num, 1, __ATOMIC_RELAXED); if (i >= USB_MAX_FDS) return NULL; if (!parse_usb_descriptor(dev, dev_len, &usb_devices[i].index)) return NULL; __atomic_store_n(&usb_devices[i].fd, fd, __ATOMIC_RELEASE); return &usb_devices[i].index; } struct vusb_connect_string_descriptor { uint32_t len; char* str; } __attribute__((packed)); struct vusb_connect_descriptors { uint32_t qual_len; char* qual; uint32_t bos_len; char* bos; uint32_t strs_len; struct vusb_connect_string_descriptor strs[0]; } __attribute__((packed)); static const char default_string[] = {8, USB_DT_STRING, 's', 0, 'y', 0, 'z', 0}; static const char default_lang_id[] = {4, USB_DT_STRING, 0x09, 0x04}; static bool lookup_connect_response_in( int fd, const struct vusb_connect_descriptors* descs, const struct usb_ctrlrequest* ctrl, struct usb_qualifier_descriptor* qual, char** response_data, uint32_t* response_length) { struct usb_device_index* index = lookup_usb_index(fd); uint8_t str_idx; if (!index) return false; switch (ctrl->bRequestType & USB_TYPE_MASK) { case USB_TYPE_STANDARD: switch (ctrl->bRequest) { case USB_REQ_GET_DESCRIPTOR: switch (ctrl->wValue >> 8) { case USB_DT_DEVICE: *response_data = (char*)index->dev; *response_length = sizeof(*index->dev); return true; case USB_DT_CONFIG: *response_data = (char*)index->config; *response_length = index->config_length; return true; case USB_DT_STRING: str_idx = (uint8_t)ctrl->wValue; if (descs && str_idx < descs->strs_len) { *response_data = descs->strs[str_idx].str; *response_length = descs->strs[str_idx].len; return true; } if (str_idx == 0) { *response_data = (char*)&default_lang_id[0]; *response_length = default_lang_id[0]; return true; } *response_data = (char*)&default_string[0]; *response_length = default_string[0]; return true; case USB_DT_BOS: *response_data = descs->bos; *response_length = descs->bos_len; return true; case USB_DT_DEVICE_QUALIFIER: if (!descs->qual) { qual->bLength = sizeof(*qual); qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER; qual->bcdUSB = index->dev->bcdUSB; qual->bDeviceClass = index->dev->bDeviceClass; qual->bDeviceSubClass = index->dev->bDeviceSubClass; qual->bDeviceProtocol = index->dev->bDeviceProtocol; qual->bMaxPacketSize0 = index->dev->bMaxPacketSize0; qual->bNumConfigurations = index->dev->bNumConfigurations; qual->bRESERVED = 0; *response_data = (char*)qual; *response_length = sizeof(*qual); return true; } *response_data = descs->qual; *response_length = descs->qual_len; return true; default: break; } break; default: break; } break; default: break; } return false; } typedef bool (*lookup_connect_out_response_t)( int fd, const struct vusb_connect_descriptors* descs, const struct usb_ctrlrequest* ctrl, bool* done); static bool lookup_connect_response_out_generic( int fd, const struct vusb_connect_descriptors* descs, const struct usb_ctrlrequest* ctrl, bool* done) { switch (ctrl->bRequestType & USB_TYPE_MASK) { case USB_TYPE_STANDARD: switch (ctrl->bRequest) { case USB_REQ_SET_CONFIGURATION: *done = true; return true; default: break; } break; } return false; } #define UDC_NAME_LENGTH_MAX 128 struct usb_raw_init { __u8 driver_name[UDC_NAME_LENGTH_MAX]; __u8 device_name[UDC_NAME_LENGTH_MAX]; __u8 speed; }; enum usb_raw_event_type { USB_RAW_EVENT_INVALID = 0, USB_RAW_EVENT_CONNECT = 1, USB_RAW_EVENT_CONTROL = 2, }; struct usb_raw_event { __u32 type; __u32 length; __u8 data[0]; }; struct usb_raw_ep_io { __u16 ep; __u16 flags; __u32 length; __u8 data[0]; }; #define USB_RAW_EPS_NUM_MAX 30 #define USB_RAW_EP_NAME_MAX 16 #define USB_RAW_EP_ADDR_ANY 0xff struct usb_raw_ep_caps { __u32 type_control : 1; __u32 type_iso : 1; __u32 type_bulk : 1; __u32 type_int : 1; __u32 dir_in : 1; __u32 dir_out : 1; }; struct usb_raw_ep_limits { __u16 maxpacket_limit; __u16 max_streams; __u32 reserved; }; struct usb_raw_ep_info { __u8 name[USB_RAW_EP_NAME_MAX]; __u32 addr; struct usb_raw_ep_caps caps; struct usb_raw_ep_limits limits; }; struct usb_raw_eps_info { struct usb_raw_ep_info eps[USB_RAW_EPS_NUM_MAX]; }; #define USB_RAW_IOCTL_INIT _IOW('U', 0, struct usb_raw_init) #define USB_RAW_IOCTL_RUN _IO('U', 1) #define USB_RAW_IOCTL_EVENT_FETCH _IOR('U', 2, struct usb_raw_event) #define USB_RAW_IOCTL_EP0_WRITE _IOW('U', 3, struct usb_raw_ep_io) #define USB_RAW_IOCTL_EP0_READ _IOWR('U', 4, struct usb_raw_ep_io) #define USB_RAW_IOCTL_EP_ENABLE _IOW('U', 5, struct usb_endpoint_descriptor) #define USB_RAW_IOCTL_EP_DISABLE _IOW('U', 6, __u32) #define USB_RAW_IOCTL_EP_WRITE _IOW('U', 7, struct usb_raw_ep_io) #define USB_RAW_IOCTL_EP_READ _IOWR('U', 8, struct usb_raw_ep_io) #define USB_RAW_IOCTL_CONFIGURE _IO('U', 9) #define USB_RAW_IOCTL_VBUS_DRAW _IOW('U', 10, __u32) #define USB_RAW_IOCTL_EPS_INFO _IOR('U', 11, struct usb_raw_eps_info) #define USB_RAW_IOCTL_EP0_STALL _IO('U', 12) #define USB_RAW_IOCTL_EP_SET_HALT _IOW('U', 13, __u32) #define USB_RAW_IOCTL_EP_CLEAR_HALT _IOW('U', 14, __u32) #define USB_RAW_IOCTL_EP_SET_WEDGE _IOW('U', 15, __u32) static int usb_raw_open() { return open("/dev/raw-gadget", O_RDWR); } static int usb_raw_init(int fd, uint32_t speed, const char* driver, const char* device) { struct usb_raw_init arg; strncpy((char*)&arg.driver_name[0], driver, sizeof(arg.driver_name)); strncpy((char*)&arg.device_name[0], device, sizeof(arg.device_name)); arg.speed = speed; return ioctl(fd, USB_RAW_IOCTL_INIT, &arg); } static int usb_raw_run(int fd) { return ioctl(fd, USB_RAW_IOCTL_RUN, 0); } static int usb_raw_configure(int fd) { return ioctl(fd, USB_RAW_IOCTL_CONFIGURE, 0); } static int usb_raw_vbus_draw(int fd, uint32_t power) { return ioctl(fd, USB_RAW_IOCTL_VBUS_DRAW, power); } static int usb_raw_ep0_write(int fd, struct usb_raw_ep_io* io) { return ioctl(fd, USB_RAW_IOCTL_EP0_WRITE, io); } static int usb_raw_ep0_read(int fd, struct usb_raw_ep_io* io) { return ioctl(fd, USB_RAW_IOCTL_EP0_READ, io); } static int usb_raw_event_fetch(int fd, struct usb_raw_event* event) { return ioctl(fd, USB_RAW_IOCTL_EVENT_FETCH, event); } static int usb_raw_ep_enable(int fd, struct usb_endpoint_descriptor* desc) { return ioctl(fd, USB_RAW_IOCTL_EP_ENABLE, desc); } static int usb_raw_ep_disable(int fd, int ep) { return ioctl(fd, USB_RAW_IOCTL_EP_DISABLE, ep); } static int usb_raw_ep0_stall(int fd) { return ioctl(fd, USB_RAW_IOCTL_EP0_STALL, 0); } #define USB_MAX_PACKET_SIZE 4096 struct usb_raw_control_event { struct usb_raw_event inner; struct usb_ctrlrequest ctrl; char data[USB_MAX_PACKET_SIZE]; }; struct usb_raw_ep_io_data { struct usb_raw_ep_io inner; char data[USB_MAX_PACKET_SIZE]; }; static void set_interface(int fd, int n) { struct usb_device_index* index = lookup_usb_index(fd); if (!index) return; if (index->iface_cur >= 0 && index->iface_cur < index->ifaces_num) { for (int ep = 0; ep < index->ifaces[index->iface_cur].eps_num; ep++) { int rv = usb_raw_ep_disable( fd, index->ifaces[index->iface_cur].eps[ep].handle); if (rv < 0) { } else { } } } if (n >= 0 && n < index->ifaces_num) { for (int ep = 0; ep < index->ifaces[n].eps_num; ep++) { int rv = usb_raw_ep_enable(fd, &index->ifaces[n].eps[ep].desc); if (rv < 0) { } else { index->ifaces[n].eps[ep].handle = rv; } } index->iface_cur = n; } } static int configure_device(int fd) { struct usb_device_index* index = lookup_usb_index(fd); if (!index) return -1; int rv = usb_raw_vbus_draw(fd, index->bMaxPower); if (rv < 0) { return rv; } rv = usb_raw_configure(fd); if (rv < 0) { return rv; } set_interface(fd, 0); return 0; } static volatile long syz_usb_connect_impl( uint64_t speed, uint64_t dev_len, const char* dev, const struct vusb_connect_descriptors* descs, lookup_connect_out_response_t lookup_connect_response_out) { if (!dev) { return -1; } int fd = usb_raw_open(); if (fd < 0) { return fd; } if (fd >= MAX_FDS) { close(fd); return -1; } struct usb_device_index* index = add_usb_index(fd, dev, dev_len); if (!index) { return -1; } char device[32]; sprintf(&device[0], "dummy_udc.%llu", procid); int rv = usb_raw_init(fd, speed, "dummy_udc", &device[0]); if (rv < 0) { return rv; } rv = usb_raw_run(fd); if (rv < 0) { return rv; } bool done = false; while (!done) { struct usb_raw_control_event event; event.inner.type = 0; event.inner.length = sizeof(event.ctrl); rv = usb_raw_event_fetch(fd, (struct usb_raw_event*)&event); if (rv < 0) { return rv; } if (event.inner.type != USB_RAW_EVENT_CONTROL) continue; char* response_data = NULL; uint32_t response_length = 0; struct usb_qualifier_descriptor qual; if (event.ctrl.bRequestType & USB_DIR_IN) { if (!lookup_connect_response_in(fd, descs, &event.ctrl, &qual, &response_data, &response_length)) { usb_raw_ep0_stall(fd); continue; } } else { if (!lookup_connect_response_out(fd, descs, &event.ctrl, &done)) { usb_raw_ep0_stall(fd); continue; } response_data = NULL; response_length = event.ctrl.wLength; } if ((event.ctrl.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD && event.ctrl.bRequest == USB_REQ_SET_CONFIGURATION) { rv = configure_device(fd); if (rv < 0) { return rv; } } struct usb_raw_ep_io_data response; response.inner.ep = 0; response.inner.flags = 0; if (response_length > sizeof(response.data)) response_length = 0; if (event.ctrl.wLength < response_length) response_length = event.ctrl.wLength; response.inner.length = response_length; if (response_data) memcpy(&response.data[0], response_data, response_length); else memset(&response.data[0], 0, response_length); if (event.ctrl.bRequestType & USB_DIR_IN) { rv = usb_raw_ep0_write(fd, (struct usb_raw_ep_io*)&response); } else { rv = usb_raw_ep0_read(fd, (struct usb_raw_ep_io*)&response); } if (rv < 0) { return rv; } } sleep_ms(200); return fd; } static volatile long syz_usb_connect(volatile long a0, volatile long a1, volatile long a2, volatile long a3) { uint64_t speed = a0; uint64_t dev_len = a1; const char* dev = (const char*)a2; const struct vusb_connect_descriptors* descs = (const struct vusb_connect_descriptors*)a3; return syz_usb_connect_impl(speed, dev_len, dev, descs, &lookup_connect_response_out_generic); } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); for (int i = 0; i < 100; i++) { if (waitpid(-1, status, WNOHANG | __WALL) == pid) return; usleep(1000); } DIR* dir = opendir("/sys/fs/fuse/connections"); if (dir) { for (;;) { struct dirent* ent = readdir(dir); if (!ent) break; if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) continue; char abort[300]; snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name); int fd = open(abort, O_WRONLY); if (fd == -1) { continue; } if (write(fd, abort, 1) < 0) { } close(fd); } closedir(dir); } else { } while (waitpid(-1, status, __WALL) != pid) { } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter = 0; for (;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); exit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; sleep_ms(1); if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } } } void execute_one(void) { *(uint8_t*)0x20000040 = 0x12; *(uint8_t*)0x20000041 = 1; *(uint16_t*)0x20000042 = 0; *(uint8_t*)0x20000044 = 0x42; *(uint8_t*)0x20000045 = 0x21; *(uint8_t*)0x20000046 = 0x7a; *(uint8_t*)0x20000047 = 0x40; *(uint16_t*)0x20000048 = 0x413; *(uint16_t*)0x2000004a = 0x6023; *(uint16_t*)0x2000004c = 0xc128; *(uint8_t*)0x2000004e = 0; *(uint8_t*)0x2000004f = 0; *(uint8_t*)0x20000050 = 0; *(uint8_t*)0x20000051 = 1; *(uint8_t*)0x20000052 = 9; *(uint8_t*)0x20000053 = 2; *(uint16_t*)0x20000054 = 0xdb; *(uint8_t*)0x20000056 = 1; *(uint8_t*)0x20000057 = 0; *(uint8_t*)0x20000058 = 0; *(uint8_t*)0x20000059 = 0; *(uint8_t*)0x2000005a = 0; *(uint8_t*)0x2000005b = 9; *(uint8_t*)0x2000005c = 4; *(uint8_t*)0x2000005d = 0x44; *(uint8_t*)0x2000005e = 0; *(uint8_t*)0x2000005f = 0xf; *(uint8_t*)0x20000060 = 0x2b; *(uint8_t*)0x20000061 = 0xb6; *(uint8_t*)0x20000062 = 0x34; *(uint8_t*)0x20000063 = 0; *(uint8_t*)0x20000064 = 9; *(uint8_t*)0x20000065 = 5; *(uint8_t*)0x20000066 = 0x40; *(uint8_t*)0x20000067 = 8; *(uint16_t*)0x20000068 = 0x10; *(uint8_t*)0x2000006a = 0x7f; *(uint8_t*)0x2000006b = 0x80; *(uint8_t*)0x2000006c = 0xdb; *(uint8_t*)0x2000006d = 2; *(uint8_t*)0x2000006e = 0x22; *(uint8_t*)0x2000006f = 7; *(uint8_t*)0x20000070 = 0x25; *(uint8_t*)0x20000071 = 1; *(uint8_t*)0x20000072 = 0x80; *(uint8_t*)0x20000073 = 7; *(uint16_t*)0x20000074 = 9; *(uint8_t*)0x20000076 = 9; *(uint8_t*)0x20000077 = 5; *(uint8_t*)0x20000078 = 0x82; *(uint8_t*)0x20000079 = 4; *(uint16_t*)0x2000007a = 0x200; *(uint8_t*)0x2000007c = 0x2c; *(uint8_t*)0x2000007d = 0x33; *(uint8_t*)0x2000007e = 9; *(uint8_t*)0x2000007f = 7; *(uint8_t*)0x20000080 = 0x25; *(uint8_t*)0x20000081 = 1; *(uint8_t*)0x20000082 = 3; *(uint8_t*)0x20000083 = 0x3f; *(uint16_t*)0x20000084 = 0xf49; *(uint8_t*)0x20000086 = 7; *(uint8_t*)0x20000087 = 0x25; *(uint8_t*)0x20000088 = 1; *(uint8_t*)0x20000089 = 2; *(uint8_t*)0x2000008a = 7; *(uint16_t*)0x2000008b = 0x400; *(uint8_t*)0x2000008d = 9; *(uint8_t*)0x2000008e = 5; *(uint8_t*)0x2000008f = 0xa; *(uint8_t*)0x20000090 = 4; *(uint16_t*)0x20000091 = 0x20; *(uint8_t*)0x20000093 = 4; *(uint8_t*)0x20000094 = 3; *(uint8_t*)0x20000095 = 0x80; *(uint8_t*)0x20000096 = 9; *(uint8_t*)0x20000097 = 5; *(uint8_t*)0x20000098 = 0xf; *(uint8_t*)0x20000099 = 0; *(uint16_t*)0x2000009a = 0x200; *(uint8_t*)0x2000009c = 0xbb; *(uint8_t*)0x2000009d = 0x17; *(uint8_t*)0x2000009e = 1; *(uint8_t*)0x2000009f = 9; *(uint8_t*)0x200000a0 = 5; *(uint8_t*)0x200000a1 = 0xb; *(uint8_t*)0x200000a2 = 0x10; *(uint16_t*)0x200000a3 = 8; *(uint8_t*)0x200000a5 = 5; *(uint8_t*)0x200000a6 = 0x3f; *(uint8_t*)0x200000a7 = 0; *(uint8_t*)0x200000a8 = 7; *(uint8_t*)0x200000a9 = 0x25; *(uint8_t*)0x200000aa = 1; *(uint8_t*)0x200000ab = 0x80; *(uint8_t*)0x200000ac = 0x81; *(uint16_t*)0x200000ad = 0xa62b; *(uint8_t*)0x200000af = 9; *(uint8_t*)0x200000b0 = 5; *(uint8_t*)0x200000b1 = 4; *(uint8_t*)0x200000b2 = 0; *(uint16_t*)0x200000b3 = 0x200; *(uint8_t*)0x200000b5 = 1; *(uint8_t*)0x200000b6 = 4; *(uint8_t*)0x200000b7 = 0x1f; *(uint8_t*)0x200000b8 = 9; *(uint8_t*)0x200000b9 = 5; *(uint8_t*)0x200000ba = 0xb; *(uint8_t*)0x200000bb = 4; *(uint16_t*)0x200000bc = 0x10; *(uint8_t*)0x200000be = 0x12; *(uint8_t*)0x200000bf = 0xea; *(uint8_t*)0x200000c0 = 0xc; *(uint8_t*)0x200000c1 = 2; *(uint8_t*)0x200000c2 = 0x21; *(uint8_t*)0x200000c3 = 2; *(uint8_t*)0x200000c4 = 0xb; *(uint8_t*)0x200000c5 = 9; *(uint8_t*)0x200000c6 = 5; *(uint8_t*)0x200000c7 = 0xc; *(uint8_t*)0x200000c8 = 0xc; *(uint16_t*)0x200000c9 = 0x40; *(uint8_t*)0x200000cb = 6; *(uint8_t*)0x200000cc = 0xa4; *(uint8_t*)0x200000cd = 8; *(uint8_t*)0x200000ce = 9; *(uint8_t*)0x200000cf = 5; *(uint8_t*)0x200000d0 = 0xb; *(uint8_t*)0x200000d1 = 0x10; *(uint16_t*)0x200000d2 = 0x10; *(uint8_t*)0x200000d4 = 4; *(uint8_t*)0x200000d5 = 0x20; *(uint8_t*)0x200000d6 = 7; *(uint8_t*)0x200000d7 = 7; *(uint8_t*)0x200000d8 = 0x25; *(uint8_t*)0x200000d9 = 1; *(uint8_t*)0x200000da = 3; *(uint8_t*)0x200000db = 3; *(uint16_t*)0x200000dc = 0xff34; *(uint8_t*)0x200000de = 9; *(uint8_t*)0x200000df = 5; *(uint8_t*)0x200000e0 = 2; *(uint8_t*)0x200000e1 = 0xc; *(uint16_t*)0x200000e2 = 0x10; *(uint8_t*)0x200000e4 = 2; *(uint8_t*)0x200000e5 = 1; *(uint8_t*)0x200000e6 = -1; *(uint8_t*)0x200000e7 = 7; *(uint8_t*)0x200000e8 = 0x25; *(uint8_t*)0x200000e9 = 1; *(uint8_t*)0x200000ea = 0x80; *(uint8_t*)0x200000eb = 4; *(uint16_t*)0x200000ec = 6; *(uint8_t*)0x200000ee = 7; *(uint8_t*)0x200000ef = 0x25; *(uint8_t*)0x200000f0 = 1; *(uint8_t*)0x200000f1 = 0x82; *(uint8_t*)0x200000f2 = 1; *(uint16_t*)0x200000f3 = 9; *(uint8_t*)0x200000f5 = 9; *(uint8_t*)0x200000f6 = 5; *(uint8_t*)0x200000f7 = 0xa; *(uint8_t*)0x200000f8 = 0; *(uint16_t*)0x200000f9 = 0x40; *(uint8_t*)0x200000fb = 0x80; *(uint8_t*)0x200000fc = 0x7f; *(uint8_t*)0x200000fd = 0xf9; *(uint8_t*)0x200000fe = 7; *(uint8_t*)0x200000ff = 0x25; *(uint8_t*)0x20000100 = 1; *(uint8_t*)0x20000101 = 0x80; *(uint8_t*)0x20000102 = 0x40; *(uint16_t*)0x20000103 = 0x800; *(uint8_t*)0x20000105 = 9; *(uint8_t*)0x20000106 = 5; *(uint8_t*)0x20000107 = 5; *(uint8_t*)0x20000108 = 0xc; *(uint16_t*)0x20000109 = 0x20; *(uint8_t*)0x2000010b = 6; *(uint8_t*)0x2000010c = 0; *(uint8_t*)0x2000010d = 5; *(uint8_t*)0x2000010e = 2; *(uint8_t*)0x2000010f = 5; *(uint8_t*)0x20000110 = 2; *(uint8_t*)0x20000111 = 7; *(uint8_t*)0x20000112 = 9; *(uint8_t*)0x20000113 = 5; *(uint8_t*)0x20000114 = 7; *(uint8_t*)0x20000115 = 3; *(uint16_t*)0x20000116 = 0x10; *(uint8_t*)0x20000118 = 0xfd; *(uint8_t*)0x20000119 = 4; *(uint8_t*)0x2000011a = 0x40; *(uint8_t*)0x2000011b = 9; *(uint8_t*)0x2000011c = 5; *(uint8_t*)0x2000011d = 7; *(uint8_t*)0x2000011e = 7; *(uint16_t*)0x2000011f = 8; *(uint8_t*)0x20000121 = 0; *(uint8_t*)0x20000122 = 9; *(uint8_t*)0x20000123 = 0x81; *(uint8_t*)0x20000124 = 9; *(uint8_t*)0x20000125 = 5; *(uint8_t*)0x20000126 = 0xe; *(uint8_t*)0x20000127 = 0x10; *(uint16_t*)0x20000128 = 0x400; *(uint8_t*)0x2000012a = 1; *(uint8_t*)0x2000012b = 8; *(uint8_t*)0x2000012c = 0x20; syz_usb_connect(/*speed=*/0, /*dev_len=*/0xed, /*dev=*/0x20000040, /*conn_descs=*/0); } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); loop(); return 0; } =* repro.txt =* syz_usb_connect(0x0, 0x432, &(0x7f0000000040)={{0x12, 0x1, 0x0, 0x42, 0x21, 0x7a, 0x40, 0x413, 0x6023, 0xc128, 0x0, 0x0, 0x0, 0x1, [{{0x9,0x2, 0x420, 0x1, 0x0, 0x0, 0x0, 0x0, [{{0x9, 0x4, 0x44, 0x0, 0xf, 0x2b, 0xb6, 0x34, 0x0, [], [{{0x9, 0x5, 0x65268aa22f44d640, 0x8, 0x10, 0x7f, 0x80, 0xdb, [@generic={0x57, 0x22, "6842ca7bf31d0143618a52cac09b83bff3f60fa0736b77c6eccaf7eb500c0ec59af07a8ce80cef3c2c0d57a13d8171c83cddcf772e53cdd9c1c10b732a821410d572c5528ac48f055a3844538aada94f2d8702fab1"}, @uac_iso={0x7, 0x25, 0x1, 0x80, 0x7, 0x9}]}}, {{0x9, 0x5, 0x82, 0x4, 0x200, 0x2c, 0x33, 0x9, [@uac_iso={0x7, 0x25, 0x1, 0x3, 0x3f, 0xf49}, @uac_iso={0x7, 0x25, 0x1, 0x2, 0x7, 0x400}]}}, {{0x9, 0x5, 0xa, 0x4, 0x20, 0x4, 0x3, 0x80}}, {{0x9, 0x5, 0xf, 0x0, 0x200, 0xbb, 0x17, 0x1}}, {{0x9, 0x5, 0xb, 0x10, 0x8, 0x5, 0x3f, 0x0, [@uac_iso={0x7, 0x25, 0x1, 0x80, 0x81, 0xa62b}]}}, {{0x9, 0x5, 0x4, 0x0, 0x200, 0x1, 0x4, 0x1f}}, {{0x9, 0x5, 0xb, 0x4, 0x10, 0x12, 0xea, 0xc, [@generic={0xed, 0x21, "08127f0f4f83fec83e08741a32c7e58422f72562136cd7b9d82db0c264c2fc37abfca1db646e6be411deadb2b650255eac8917df8f3f36c97efef0d23c90c281df73c0c07a5f3cdd23b1249a7465827a62acb89f43161251f496e961b2bada6e06551dafd2a52c93cc8685180dc1eca124e289ba9f1deddbb6ad0cf34b8a36d61937c472ae928155ca9943bc2b6eb3c3a8169951a8e8c6e9bc1b4eaa236e90b9694fc42b1a0712581cfd2ad60c63017370e0cc354856748351a049eb031b63d4539aa4cea7e62b4ab706d01ed6947263c2453a87e4d288df723b76f2481ef425dc2799ff3816d5095a9835"}, @generic={0xf9, 0xb, "dce59870ed7c15d59e2f62353374609704da54e4b507d263b09deb7c3c01236058718d919238a938221dc97681d20c639a5ebcd2dfe08c2c20672e3afd1121783144061974eb7d818536515d97db0cc1983cfa4de27b9ac3f8363a7da644886592f39a00d799c8887bc3300bb508a62afd0fc9a5f366b06fd04ede53b62cec94845eab41b138fffb86e04ed868592e463119faf7453c77b4b1f12c01d94c187279a5e3f673105824531de3cc89b127a03843e874f051ab35af668d61efc294cfe8c8726fc1d0ec4754fea52c35b61682af3d6c722edb819128cb95320e6e72a74073fcb14bfada62a389d25d0cce2fdaa4922b8d167f89"}]}}, {{0x9, 0x5, 0xc, 0xc, 0x40, 0x6, 0xa4, 0x8}}, {{0x9, 0x5, 0xb, 0x10, 0x10, 0x4, 0x20, 0x7, [@uac_iso={0x7, 0x25, 0x1, 0x3, 0x3, 0xff34}]}}, {{0x9, 0x5, 0x2, 0xc, 0x10, 0x2, 0x1, 0xff, [@uac_iso={0x7, 0x25, 0x1, 0x80, 0x4, 0x6}, @uac_iso={0x7, 0x25, 0x1, 0x82, 0x1, 0x9}]}}, {{0x9, 0x5, 0xa, 0x0, 0x40, 0x80, 0x7f, 0xf9, [@uac_iso={0x7, 0x25, 0x1, 0x80, 0x40, 0x800}]}}, {{0x9, 0x5, 0x5, 0xc, 0x20, 0x6, 0x0, 0x5, [@generic={0x7a, 0x5, "e39ae978b524cf1a138e7d85bbb05621f8bb638e46c34283cbd6133b287a2d0fdca0a81b5bf5844913d5b648914f94cc9c7fafb04471e90e5aab900141c5ba31a10afefa666446c570700e0a324ab93f48eb9c2ea15970f19ecec27fa412f8c549bad2cd378512dbd4820973d7fd56ec1f0ef6003187ca18"}, @generic={0x98, 0x7, "1d595e30b5dd2d17a99443dba7bd307a99e0018050c69bbdaa0917291dd754ef39acd49ecbe36f9e8086f0d7ec384ba81f18056b4f4cb4c08189589e63a0e7366681d16d77837b9961f34c5e1e162c51d51f848edda2c9a81d696383e11cc7ee3bca076aeadf60b158cf17084872b168377c928b5dd80c2612de496483e06076cf4d456e8d26dca9b1dbc42d89ef8518e4f6457ae8d7"}]}}, {{0x9, 0x5, 0x7, 0x3, 0x10, 0xfd, 0x4, 0x40}}, {{0x9, 0x5, 0x7, 0x7, 0x8, 0x0, 0x9, 0x81}}, {{0x9, 0x5, 0xe, 0x10, 0x400, 0x1, 0x8, 0x20}}]}}]}}]}}, 0x0) and the bug titled "KASAN: slab-use-after-free Read in em28xx_release_resources” also have a repro.prog =* repro1.txt =* executing program 0: syz_usb_connect(0x0, 0xed, &(0x7f0000000040)={{0x12, 0x1, 0x0, 0x42, 0x21, 0x7a, 0x40, 0x413, 0x6023, 0xc128, 0x0, 0x0, 0x0, 0x1, [{{0x9, 0x2, 0xdb, 0x1, 0x0, 0x0, 0x0, 0x0, [{{0x9, 0x4, 0x44, 0x0, 0xf, 0x2b, 0xb6, 0x34, 0x0, [], [{{0x9, 0x5, 0x65268aa22f44d640, 0x8, 0x10, 0x7f, 0x80, 0xdb, [@generic={0x2, 0x22}, @uac_iso={0x7, 0x25, 0x1, 0x80, 0x7, 0x9}]}}, {{0x9, 0x5, 0x82, 0x4, 0x200, 0x2c, 0x33, 0x9, [@uac_iso={0x7, 0x25, 0x1, 0x3, 0x3f, 0xf49}, @uac_iso={0x7, 0x25, 0x1, 0x2, 0x7, 0x400}]}}, {{0x9, 0x5, 0xa, 0x4, 0x20, 0x4, 0x3, 0x80}}, {{0x9, 0x5, 0xf, 0x0, 0x200, 0xbb, 0x17, 0x1}}, {{0x9, 0x5, 0xb, 0x10, 0x8, 0x5, 0x3f, 0x0, [@uac_iso={0x7, 0x25, 0x1, 0x80, 0x81, 0xa62b}]}}, {{0x9, 0x5, 0x4, 0x0, 0x200, 0x1, 0x4, 0x1f}}, {{0x9, 0x5, 0xb, 0x4, 0x10, 0x12, 0xea, 0xc, [@generic={0x2, 0x21}, @generic={0x2, 0xb}]}}, {{0x9, 0x5, 0xc, 0xc, 0x40, 0x6, 0xa4, 0x8}}, {{0x9, 0x5, 0xb, 0x10, 0x10, 0x4, 0x20, 0x7, [@uac_iso={0x7, 0x25, 0x1, 0x3, 0x3, 0xff34}]}}, {{0x9, 0x5, 0x2, 0xc, 0x10, 0x2, 0x1, 0xff, [@uac_iso={0x7, 0x25, 0x1, 0x80, 0x4, 0x6}, @uac_iso={0x7, 0x25, 0x1, 0x82, 0x1, 0x9}]}}, {{0x9, 0x5, 0xa, 0x0, 0x40, 0x80, 0x7f, 0xf9, [@uac_iso={0x7, 0x25, 0x1, 0x80, 0x40, 0x800}]}}, {{0x9, 0x5, 0x5, 0xc, 0x20, 0x6, 0x0, 0x5, [@generic={0x2, 0x5}, @generic={0x2, 0x7}]}}, {{0x9, 0x5, 0x7, 0x3, 0x10, 0xfd, 0x4, 0x40}}, {{0x9, 0x5, 0x7, 0x7, 0x8, 0x0, 0x9, 0x81}}, {{0x9, 0x5, 0xe, 0x10, 0x400, 0x1, 0x8, 0x20}}]}}]}}]}}, 0x0) please run it with syz-execprog -repeat 0 ./repro.txt, it will trigger the bug. See aslo https://gist.github.com/xrivendell7/65437409377f91fc28a04867956fa9e0. I hope it helps. Best regards. xingwei Lee
