fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
==================================================================
should_fail_alloc_page mm/page_alloc.c:2898 [inline]
prepare_alloc_pages mm/page_alloc.c:4165 [inline]
__alloc_pages_nodemask+0x21e/0x2900 mm/page_alloc.c:4213
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 ffff8880aeb26c5c by task syz-executor.0/32041
__alloc_pages include/linux/gfp.h:484 [inline]
__alloc_pages_node include/linux/gfp.h:497 [inline]
kmem_getpages mm/slab.c:1419 [inline]
cache_grow_begin+0x91/0x700 mm/slab.c:2676
cache_alloc_refill+0x273/0x350 mm/slab.c:3043
____cache_alloc mm/slab.c:3125 [inline]
slab_alloc_node mm/slab.c:3320 [inline]
kmem_cache_alloc_node_trace+0x3e5/0x400 mm/slab.c:3659
__do_kmalloc_node mm/slab.c:3681 [inline]
__kmalloc_node+0x38/0x70 mm/slab.c:3689
kmalloc_node include/linux/slab.h:530 [inline]
kvmalloc_node+0x46/0xd0 mm/util.c:430
kvmalloc include/linux/mm.h:531 [inline]
kvzalloc include/linux/mm.h:539 [inline]
snd_pcm_oss_change_params_locked+0x1ef4/0x3550 sound/core/oss/pcm_oss.c:1086
snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1121 [inline]
snd_pcm_oss_make_ready+0xbb/0x170 sound/core/oss/pcm_oss.c:1180
snd_pcm_oss_sync+0x1be/0x740 sound/core/oss/pcm_oss.c:1741
snd_pcm_oss_release+0x26b/0x2f0 sound/core/oss/pcm_oss.c:2584
__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
RIP: 0033:0x7f956e3280d9
RSP: 002b:00007f956c89a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007f956e447f80 RCX: 00007f956e3280d9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f956c89a1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd8948babf R14: 00007f956c89a300 R15: 0000000000022000
CPU: 0 PID: 32041 Comm: syz-executor.0 Not tainted 4.14.301-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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:252
kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
kasan_report mm/kasan/report.c:409 [inline]
__asan_report_load4_noabort+0x68/0x70 mm/kasan/report.c:429
__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_read fs/read_write.c:574 [inline]
SyS_read+0xf2/0x210 fs/read_write.c:567
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f169ad840d9
RSP: 002b:00007f16992f6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f169aea3f80 RCX: 00007f169ad840d9
RDX: 0000000000001000 RSI: 0000000020000980 RDI: 0000000000000003
RBP: 00007f169addfae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdfbfce58f R14: 00007f16992f6300 R15: 0000000000022000
Allocated by task 32041:
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_read fs/read_write.c:574 [inline]
SyS_read+0xf2/0x210 fs/read_write.c:567
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x5e/0xd3
Freed by task 32036:
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 ffff8880aeb26940
which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 796 bytes inside of
1024-byte region [ffff8880aeb26940, ffff8880aeb26d40)
The buggy address belongs to the page:
page:ffffea0002bac980 count:1 mapcount:0 mapping:ffff8880aeb26040 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff8880aeb26040 0000000000000000 0000000100000007
raw: ffffea0002d0cca0 ffffea00024d3420 ffff88813fe74ac0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880aeb26b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880aeb26b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880aeb26c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880aeb26c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880aeb26d00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================