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BUG: KASAN: out-of-bounds in v4l2_fh_init+0x274/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25
Read of size 8 at addr ffff88806087c900 by task v4l_id/4897

CPU: 0 PID: 4897 Comm: v4l_id Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247
 __kasan_report mm/kasan/report.c:433 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:450
 v4l2_fh_init+0x274/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25
 v4l2_fh_open+0x78/0xb0 drivers/media/v4l2-core/v4l2-fh.c:63
 em28xx_v4l2_open+0xd6/0x430 drivers/media/usb/em28xx/em28xx-video.c:2163
 v4l2_open+0x1e3/0x370 drivers/media/v4l2-core/v4l2-dev.c:427
 chrdev_open+0x20f/0x650 fs/char_dev.c:414
 do_dentry_open+0x429/0x1040 fs/open.c:822
 do_open fs/namei.c:3426 [inline]
 path_openat+0x9ea/0x2250 fs/namei.c:3559
 do_filp_open+0x199/0x3d0 fs/namei.c:3586
 do_sys_openat2+0x11e/0x400 fs/open.c:1212
 do_sys_open fs/open.c:1228 [inline]
 __do_sys_openat fs/open.c:1244 [inline]
 __se_sys_openat fs/open.c:1239 [inline]
 __x64_sys_openat+0x11b/0x1d0 fs/open.c:1239
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fefcad81697
Code: 25 00 00 41 00 3d 00 00 41 00 74 37 64 8b 04 25 18 00 00 00 85 c0 75 5b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 85 00 00 00 48 83 c4 68 5d 41 5c c3 0f 1f
RSP: 002b:00007fff4e218390 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00005616696d7c40 RCX: 00007fefcad81697
RDX: 0000000000000000 RSI: 00007fff4e218f1e RDI: 00000000ffffff9c
RBP: 00007fff4e218f1e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

The buggy address belongs to the page:
page:ffffea0001821f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6087c
head:ffffea0001821f00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010000(head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x140dc0(GFP_USER|__GFP_COMP|__GFP_ZERO), pid 3658, ts 159306605386, free_ts 159297204569
 prep_new_page mm/page_alloc.c:2418 [inline]
 get_page_from_freelist+0xa6f/0x2f10 mm/page_alloc.c:4149
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369
 kmalloc_order+0x34/0xf0 mm/slab_common.c:949
 kmalloc_order_trace+0x14/0x120 mm/slab_common.c:965
 kmalloc_large include/linux/slab.h:519 [inline]
 kmalloc include/linux/slab.h:583 [inline]
 kzalloc include/linux/slab.h:724 [inline]
 em28xx_usb_probe+0x177/0xf90 drivers/media/usb/em28xx/em28xx-cards.c:3860
 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:517 [inline]
 really_probe+0x1c2/0xb60 drivers/base/dd.c:596
 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:751
 driver_probe_device+0x44/0x110 drivers/base/dd.c:781
 __device_attach_driver+0x185/0x250 drivers/base/dd.c:898
 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427
 __device_attach+0x1db/0x410 drivers/base/dd.c:969
 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487
 device_add+0xa57/0x1b80 drivers/base/core.c:3394
 usb_set_configuration+0xa66/0x18b0 drivers/usb/core/message.c:2170
 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1338 [inline]
 free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389
 free_unref_page_prepare mm/page_alloc.c:3309 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3388
 em28xx_v4l2_init drivers/media/usb/em28xx/em28xx-video.c:2911 [inline]
 em28xx_v4l2_init.cold+0x21f/0x2d3f drivers/media/usb/em28xx/em28xx-video.c:2520
 em28xx_init_extension+0x106/0x1c0 drivers/media/usb/em28xx/em28xx-core.c:1126
 process_one_work+0x87f/0x1450 kernel/workqueue.c:2298
 process_scheduled_works kernel/workqueue.c:2361 [inline]
 worker_thread+0x704/0x1040 kernel/workqueue.c:2450
 kthread+0x3ab/0x480 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Memory state around the buggy address:
 ffff88806087c800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88806087c880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88806087c900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                   ^
 ffff88806087c980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88806087ca00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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