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BUG: KASAN: use-after-free in __vb2_perform_fileio+0xce9/0xda0 drivers/media/v4l2-core/videobuf2-core.c:2390
Read of size 4 at addr ffff8880aa6b435c by task syz-executor.0/17170
CPU: 1 PID: 17170 Comm: syz-executor.0 Not tainted 4.14.307-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x281 lib/dump_stack.c:58
print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:251
kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:350
kasan_report mm/kasan/report.c:408 [inline]
__asan_report_load4_noabort+0x68/0x70 mm/kasan/report.c:428
__vb2_perform_fileio+0xce9/0xda0 drivers/media/v4l2-core/videobuf2-core.c:2390
vb2_fop_read+0x1ef/0x3d0 drivers/media/v4l2-core/videobuf2-v4l2.c:895
v4l2_read+0x19a/0x200 drivers/media/v4l2-core/v4l2-dev.c:309
__vfs_read+0xe4/0x620 fs/read_write.c:411
vfs_read+0x139/0x340 fs/read_write.c:447
SYSC_pread64 fs/read_write.c:612 [inline]
SyS_pread64+0x116/0x140 fs/read_write.c:599
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fc752db70f9
RSP: 002b:00007fc751329168 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
RAX: ffffffffffffffda RBX: 00007fc752ed6f80 RCX: 00007fc752db70f9
RDX: 0000000000000026 RSI: 0000000020000180 RDI: 0000000000000003
RBP: 00007fc752e12ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc577b40bf R14: 00007fc751329300 R15: 0000000000022000
Allocated by task 17170:
save_stack mm/kasan/kasan.c:447 [inline]
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618
kmalloc include/linux/slab.h:488 [inline]
kzalloc include/linux/slab.h:661 [inline]
__vb2_init_fileio+0x17f/0xa90 drivers/media/v4l2-core/videobuf2-core.c:2235
__vb2_perform_fileio+0x993/0xda0 drivers/media/v4l2-core/videobuf2-core.c:2369
vb2_fop_read+0x1ef/0x3d0 drivers/media/v4l2-core/videobuf2-v4l2.c:895
v4l2_read+0x19a/0x200 drivers/media/v4l2-core/v4l2-dev.c:309
__vfs_read+0xe4/0x620 fs/read_write.c:411
vfs_read+0x139/0x340 fs/read_write.c:447
SYSC_pread64 fs/read_write.c:612 [inline]
SyS_pread64+0x116/0x140 fs/read_write.c:599
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x5e/0xd3
Freed by task 17160:
save_stack mm/kasan/kasan.c:447 [inline]
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3496 [inline]
kfree+0xc9/0x250 mm/slab.c:3815
__vb2_cleanup_fileio+0xf5/0x150 drivers/media/v4l2-core/videobuf2-core.c:2328
vb2_core_queue_release+0x17/0x70 drivers/media/v4l2-core/videobuf2-core.c:2051
vb2_queue_release drivers/media/v4l2-core/videobuf2-v4l2.c:669 [inline]
_vb2_fop_release+0x1c1/0x280 drivers/media/v4l2-core/videobuf2-v4l2.c:840
vivid_fop_release+0x17d/0x6c0 drivers/media/platform/vivid/vivid-core.c:508
v4l2_release+0xf4/0x190 drivers/media/v4l2-core/v4l2-dev.c:446
__fput+0x25f/0x7a0 fs/file_table.c:210
task_work_run+0x11f/0x190 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x5e/0xd3
The buggy address belongs to the object at ffff8880aa6b4040
which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 796 bytes inside of
1024-byte region [ffff8880aa6b4040, ffff8880aa6b4440)
The buggy address belongs to the page:
page:ffffea0002a9ad00 count:1 mapcount:0 mapping:ffff8880aa6b4040 index:0xffff8880aa6b44c0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff8880aa6b4040 ffff8880aa6b44c0 0000000100000004
raw: ffffea0002aae0a0 ffffea00027572a0 ffff88813fe74ac0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880aa6b4200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880aa6b4280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880aa6b4300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880aa6b4380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880aa6b4400: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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