Hello,
syzbot found the following crash on:
HEAD commit: ff6409a6 usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=11295858e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=3230c37d442895b7
dashboard link: https://syzkaller.appspot.com/bug?extid=d5be9c871914696d00dc
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+d5be9c871914696d00dc@xxxxxxxxxxxxxxxxxxxxxxxxx
==================================================================
BUG: KASAN: use-after-free in usb_kill_urb+0x297/0x2c0
drivers/usb/core/urb.c:690
Read of size 8 at addr ffff8881d0756c40 by task syz-executor.3/6221
CPU: 1 PID: 6221 Comm: syz-executor.3 Not tainted 5.4.0-rc5+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xca/0x13e lib/dump_stack.c:113
print_address_description.constprop.0+0x36/0x50 mm/kasan/report.c:374
__kasan_report.cold+0x1a/0x33 mm/kasan/report.c:506
kasan_report+0xe/0x20 mm/kasan/common.c:634
usb_kill_urb+0x297/0x2c0 drivers/usb/core/urb.c:690
usbhid_close+0x15c/0x210 drivers/hid/usbhid/hid-core.c:750
hid_hw_close+0xa8/0xd0 drivers/hid/hid-core.c:2046
wacom_close+0x66/0x80 drivers/hid/wacom_sys.c:192
input_close_device+0x110/0x1a0 drivers/input/input.c:682
evdev_close_device drivers/input/evdev.c:428 [inline]
evdev_release+0x188/0x1c0 drivers/input/evdev.c:466
__fput+0x2d7/0x840 fs/file_table.c:280
task_work_run+0x13f/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x1d2/0x200 arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x45f/0x580 arch/x86/entry/common.c:300
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413ce1
Code: 75 14 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48
83 ec 08 e8 0a fa ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48
89 c2 e8 53 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fa7dca607a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffea RBX: 6666666666666667 RCX: 0000000000413ce1
RDX: 0000000000000000 RSI: 0000000000004000 RDI: 00007fa7dca60850
RBP: 000000000075bf20 R08: 000000000000000f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fa7dca616d4
R13: 00000000004c9a00 R14: 00000000004e1728 R15: 00000000ffffffff
Allocated by task 22:
save_stack+0x1b/0x80 mm/kasan/common.c:69
set_track mm/kasan/common.c:77 [inline]
__kasan_kmalloc mm/kasan/common.c:510 [inline]
__kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:483
kmalloc include/linux/slab.h:561 [inline]
usb_alloc_urb+0x65/0xb0 drivers/usb/core/urb.c:73
usbhid_start+0xb26/0x22f0 drivers/hid/usbhid/hid-core.c:1121
hid_hw_start+0x5d/0x130 drivers/hid/hid-core.c:1976
wacom_parse_and_register+0x28a0/0x51e0 drivers/hid/wacom_sys.c:2365
wacom_probe+0x94d/0xba0 drivers/hid/wacom_sys.c:2748
hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2209
really_probe+0x281/0x6d0 drivers/base/dd.c:548
driver_probe_device+0x104/0x210 drivers/base/dd.c:721
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x360 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0xae6/0x16f0 drivers/base/core.c:2202
hid_add_device drivers/hid/hid-core.c:2365 [inline]
hid_add_device+0x33c/0x9a0 drivers/hid/hid-core.c:2314
usbhid_probe+0xa81/0xfa0 drivers/hid/usbhid/hid-core.c:1386
usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
really_probe+0x281/0x6d0 drivers/base/dd.c:548
driver_probe_device+0x104/0x210 drivers/base/dd.c:721
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x360 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0xae6/0x16f0 drivers/base/core.c:2202
usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
really_probe+0x281/0x6d0 drivers/base/dd.c:548
driver_probe_device+0x104/0x210 drivers/base/dd.c:721
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x360 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0xae6/0x16f0 drivers/base/core.c:2202
usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2537
hub_port_connect drivers/usb/core/hub.c:5184 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
port_event drivers/usb/core/hub.c:5470 [inline]
hub_event+0x1df8/0x3800 drivers/usb/core/hub.c:5552
process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
worker_thread+0x96/0xe20 kernel/workqueue.c:2415
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Freed by task 2758:
save_stack+0x1b/0x80 mm/kasan/common.c:69
set_track mm/kasan/common.c:77 [inline]
kasan_set_free_info mm/kasan/common.c:332 [inline]
__kasan_slab_free+0x130/0x180 mm/kasan/common.c:471
slab_free_hook mm/slub.c:1424 [inline]
slab_free_freelist_hook mm/slub.c:1475 [inline]
slab_free mm/slub.c:3025 [inline]
kfree+0xe4/0x320 mm/slub.c:3977
urb_destroy drivers/usb/core/urb.c:26 [inline]
kref_put include/linux/kref.h:65 [inline]
usb_free_urb.part.0+0x7a/0xc0 drivers/usb/core/urb.c:95
usb_free_urb+0x1b/0x30 drivers/usb/core/urb.c:94
usbhid_stop+0x1d4/0x460 drivers/hid/usbhid/hid-core.c:1217
wacom_remove+0x88/0x3b0 drivers/hid/wacom_sys.c:2772
hid_device_remove+0xed/0x240 drivers/hid/hid-core.c:2242
__device_release_driver drivers/base/dd.c:1132 [inline]
device_release_driver_internal+0x231/0x500 drivers/base/dd.c:1165
bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532
device_del+0x420/0xb20 drivers/base/core.c:2376
hid_remove_device drivers/hid/hid-core.c:2413 [inline]
hid_destroy_device+0xe1/0x150 drivers/hid/hid-core.c:2432
usbhid_disconnect+0x9f/0xe0 drivers/hid/usbhid/hid-core.c:1413
usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
__device_release_driver drivers/base/dd.c:1134 [inline]
device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165
bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532
device_del+0x420/0xb20 drivers/base/core.c:2376
usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237
usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200
hub_port_connect drivers/usb/core/hub.c:5035 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
port_event drivers/usb/core/hub.c:5470 [inline]
hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552
process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
worker_thread+0x96/0xe20 kernel/workqueue.c:2415
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
The buggy address belongs to the object at ffff8881d0756c00
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 64 bytes inside of
192-byte region [ffff8881d0756c00, ffff8881d0756cc0)
The buggy address belongs to the page:
page:ffffea000741d580 refcount:1 mapcount:0 mapping:ffff8881da002a00
index:0x0
flags: 0x200000000000200(slab)
raw: 0200000000000200 0000000000000000 0000000f00000001 ffff8881da002a00
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8881d0756b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881d0756b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8881d0756c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881d0756c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8881d0756d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
---
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