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BUG: KASAN: out-of-bounds in v4l2_fh_init+0x279/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25
Read of size 8 at addr ffff8881c72788c0 by task v4l_id/11388
CPU: 1 PID: 11388 Comm: v4l_id Not tainted 5.9.0-rc8-syzkaller #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+0x107/0x16e lib/dump_stack.c:118
print_address_description.constprop.0+0x1c/0x210 mm/kasan/report.c:383
__kasan_report mm/kasan/report.c:513 [inline]
kasan_report.cold+0x37/0x7c mm/kasan/report.c:530
v4l2_fh_init+0x279/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25
v4l2_fh_open+0x88/0xc0 drivers/media/v4l2-core/v4l2-fh.c:63
em28xx_v4l2_open+0x11c/0x570 drivers/media/usb/em28xx/em28xx-video.c:2163
v4l2_open+0x20f/0x3d0 drivers/media/v4l2-core/v4l2-dev.c:423
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b4/0x1090 fs/open.c:817
do_open fs/namei.c:3251 [inline]
path_openat+0x190d/0x2690 fs/namei.c:3368
do_filp_open+0x17e/0x3c0 fs/namei.c:3395
do_sys_openat2+0x16d/0x420 fs/open.c:1168
do_sys_open fs/open.c:1184 [inline]
__do_sys_open fs/open.c:1192 [inline]
__se_sys_open fs/open.c:1188 [inline]
__x64_sys_open+0x119/0x1c0 fs/open.c:1188
do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fee3e895840
Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24
RSP: 002b:00007ffc37239888 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007ffc372399f8 RCX: 00007fee3e895840
RDX: 00007fee3e881ea0 RSI: 0000000000000000 RDI: 00007ffc37239f22
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000555d9d9f38d0
R13: 00007ffc372399f0 R14: 0000000000000000 R15: 0000000000000000
The buggy address belongs to the page:
page:00000000914a1a5b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1c7278
flags: 0x200000000000000()
raw: 0200000000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8881c7278780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8881c7278800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881c7278880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
^
ffff8881c7278900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8881c7278980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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