================================================================== BUG: KASAN: use-after-free in v4l2_device_release+0x142/0x420 drivers/media/v4l2-core/v4l2-dev.c:196 Write of size 8 at addr ffff88802720c8a0 by task v4l_id/11034 CPU: 0 PID: 11034 Comm: v4l_id Not tainted 5.12.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x125/0x19e lib/dump_stack.c:120 print_address_description+0x5f/0x3a0 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report+0x15c/0x200 mm/kasan/report.c:416 v4l2_device_release+0x142/0x420 drivers/media/v4l2-core/v4l2-dev.c:196 device_release+0x98/0x1c0 drivers/base/core.c:2104 kobject_cleanup+0x1c9/0x280 lib/kobject.c:705 video_put drivers/media/v4l2-core/v4l2-dev.c:173 [inline] v4l2_release+0x2ba/0x3a0 drivers/media/v4l2-core/v4l2-dev.c:470 __fput+0x352/0x7b0 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x10b/0x1e0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x48/0x180 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f66175dc270 Code: 73 01 c3 48 8b 0d 38 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 59 c1 20 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 ee fb ff ff 48 89 04 24 RSP: 002b:00007ffed3b73488 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f66175dc270 RDX: 00007ffed3b734b0 RSI: 0000000080685600 RDI: 0000000000000003 RBP: 00007f6617c0d698 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000013 R13: 00007ffed3b73610 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the page: page:000000009b2e367c refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x2720c flags: 0xfff00000000000() raw: 00fff00000000000 ffffea00004d4108 ffffea0000619208 0000000000000000 raw: 0000000000000000 0000000000000002 00000000ffffff7f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88802720c780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88802720c800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88802720c880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88802720c900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88802720c980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================