On Thu, May 2, 2019 at 2:36 PM syzbot <syzbot+d53275bc1af5eb01bfff@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 43151d6c 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=145cd8ff200000 > kernel config: https://syzkaller.appspot.com/x/.config?x=4183eeef650d1234 > dashboard link: https://syzkaller.appspot.com/bug?extid=d53275bc1af5eb01bfff > 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+d53275bc1af5eb01bfff@xxxxxxxxxxxxxxxxxxxxxxxxx > > ================================================================== > BUG: KASAN: use-after-free in __lock_acquire+0x2930/0x37c0 > kernel/locking/lockdep.c:3573 > Read of size 8 at addr ffff88806b57ec90 by task v4l_id/7959 > > CPU: 0 PID: 7959 Comm: v4l_id Not tainted 5.1.0-rc3-319004-g43151d6 #6 > 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+0xe8/0x16e lib/dump_stack.c:113 > print_address_description+0x6c/0x236 mm/kasan/report.c:187 > kasan_report.cold+0x1a/0x3c mm/kasan/report.c:317 > __lock_acquire+0x2930/0x37c0 kernel/locking/lockdep.c:3573 > lock_acquire+0x10d/0x2f0 kernel/locking/lockdep.c:4211 > __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] > _raw_spin_lock_irqsave+0x44/0x60 kernel/locking/spinlock.c:152 > v4l2_fh_del+0x4e/0x270 drivers/media/v4l2-core/v4l2-fh.c:81 > v4l2_fh_release+0x46/0x70 drivers/media/v4l2-core/v4l2-fh.c:104 > v4l2_release+0x2f0/0x390 drivers/media/v4l2-core/v4l2-dev.c:459 > __fput+0x2df/0x8c0 fs/file_table.c:278 > task_work_run+0x149/0x1c0 kernel/task_work.c:113 > tracehook_notify_resume include/linux/tracehook.h:188 [inline] > exit_to_usermode_loop+0x243/0x270 arch/x86/entry/common.c:166 > prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] > syscall_return_slowpath arch/x86/entry/common.c:268 [inline] > do_syscall_64+0x40c/0x4f0 arch/x86/entry/common.c:293 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x7fd157cde2b0 > Code: 40 75 0b 31 c0 48 83 c4 08 e9 0c ff ff ff 48 8d 3d c5 32 08 00 e8 c0 > 07 02 00 83 3d 45 a3 2b 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff > ff 73 31 c3 48 83 ec 08 e8 ce 8a 01 00 48 89 04 24 > RSP: 002b:00007ffcf08bde38 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 > RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007fd157cde2b0 > RDX: 0000000000000013 RSI: 0000000080685600 RDI: 0000000000000003 > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000400884 > R13: 00007ffcf08bdf90 R14: 0000000000000000 R15: 0000000000000000 > > Allocated by task 17: > set_track mm/kasan/common.c:87 [inline] > __kasan_kmalloc mm/kasan/common.c:497 [inline] > __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:470 > slab_post_alloc_hook mm/slab.h:437 [inline] > slab_alloc_node mm/slub.c:2756 [inline] > __kmalloc_node_track_caller+0xf3/0x320 mm/slub.c:4372 > alloc_dr drivers/base/devres.c:103 [inline] > devm_kmalloc+0x8c/0x190 drivers/base/devres.c:793 > devm_kzalloc include/linux/device.h:679 [inline] > usb_raremono_probe+0x34/0x235 drivers/media/radio/radio-raremono.c:298 > usb_probe_interface+0x31d/0x820 drivers/usb/core/driver.c:361 > really_probe+0x2da/0xb10 drivers/base/dd.c:509 > driver_probe_device+0x21d/0x350 drivers/base/dd.c:671 > __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778 > bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454 > __device_attach+0x223/0x3a0 drivers/base/dd.c:844 > bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514 > device_add+0xad2/0x16e0 drivers/base/core.c:2106 > usb_set_configuration+0xdf7/0x1740 drivers/usb/core/message.c:2023 > generic_probe+0xa2/0xda drivers/usb/core/generic.c:210 > usb_probe_device+0xc0/0x150 drivers/usb/core/driver.c:266 > really_probe+0x2da/0xb10 drivers/base/dd.c:509 > driver_probe_device+0x21d/0x350 drivers/base/dd.c:671 > __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778 > bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454 > __device_attach+0x223/0x3a0 drivers/base/dd.c:844 > bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514 > device_add+0xad2/0x16e0 drivers/base/core.c:2106 > usb_new_device.cold+0x537/0xccf drivers/usb/core/hub.c:2534 > hub_port_connect drivers/usb/core/hub.c:5089 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] > port_event drivers/usb/core/hub.c:5350 [inline] > hub_event+0x138e/0x3b00 drivers/usb/core/hub.c:5432 > process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 > process_scheduled_works kernel/workqueue.c:2331 [inline] > worker_thread+0x7b0/0xe20 kernel/workqueue.c:2417 > kthread+0x313/0x420 kernel/kthread.c:253 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 > > Freed by task 17: > set_track mm/kasan/common.c:87 [inline] > __kasan_slab_free+0x130/0x180 mm/kasan/common.c:459 > slab_free_hook mm/slub.c:1429 [inline] > slab_free_freelist_hook+0x5e/0x140 mm/slub.c:1456 > slab_free mm/slub.c:3003 [inline] > kfree+0xce/0x290 mm/slub.c:3958 > release_nodes+0x4ac/0x920 drivers/base/devres.c:508 > devres_release_all+0x79/0xc8 drivers/base/devres.c:529 > __device_release_driver drivers/base/dd.c:1086 [inline] > device_release_driver_internal+0x23a/0x4f0 drivers/base/dd.c:1113 > bus_remove_device+0x302/0x5c0 drivers/base/bus.c:556 > device_del+0x467/0xb90 drivers/base/core.c:2269 > usb_disable_device+0x242/0x790 drivers/usb/core/message.c:1237 > usb_disconnect+0x298/0x870 drivers/usb/core/hub.c:2197 > hub_port_connect drivers/usb/core/hub.c:4940 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] > port_event drivers/usb/core/hub.c:5350 [inline] > hub_event+0xcd2/0x3b00 drivers/usb/core/hub.c:5432 > process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 > process_scheduled_works kernel/workqueue.c:2331 [inline] > worker_thread+0x7b0/0xe20 kernel/workqueue.c:2417 > kthread+0x313/0x420 kernel/kthread.c:253 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 > > The buggy address belongs to the object at ffff88806b57e600 > which belongs to the cache kmalloc-4k of size 4096 > The buggy address is located 1680 bytes inside of > 4096-byte region [ffff88806b57e600, ffff88806b57f600) > The buggy address belongs to the page: > page:ffffea0001ad5e00 count:1 mapcount:0 mapping:ffff88812c3f4600 index:0x0 > compound_mapcount: 0 > flags: 0xfff00000010200(slab|head) > raw: 00fff00000010200 0000000000000000 0000000100000001 ffff88812c3f4600 > raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff88806b57eb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88806b57ec00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ffff88806b57ec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff88806b57ed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88806b57ed80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ================================================================== #syz dup: KASAN: use-after-free Read in v4l2_ioctl > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
