================================================================== BUG: KASAN: use-after-free in v4l2_fh_init+0x279/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25 Read of size 8 at addr ffff8881093ec8c0 by task v4l_id/4803 CPU: 0 PID: 4803 Comm: v4l_id Not tainted 5.10.0-rc7-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+0x107/0x163 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x4c8 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562 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+0x21c/0x3f0 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:3252 [inline] path_openat+0x1b9a/0x2730 fs/namei.c:3369 do_filp_open+0x17e/0x3c0 fs/namei.c:3396 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: 0033:0x7f0c9404b840 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:00007ffd76cc3488 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffd76cc35f8 RCX: 00007f0c9404b840 RDX: 00007f0c94037ea0 RSI: 0000000000000000 RDI: 00007ffd76cc4f23 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 00005568886a88d0 R13: 00007ffd76cc35f0 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the page: page:00000000578a5e66 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x1093ec flags: 0x200000000000000() raw: 0200000000000000 ffff88823fffabd0 ffffea0004099408 0000000000000000 raw: 0000000000000000 0000000000000002 00000000ffffff7f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881093ec780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881093ec800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8881093ec880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8881093ec900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881093ec980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================