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BUG: KASAN: slab-use-after-free in v4l2_fh_init+0x27d/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25
Read of size 8 at addr ffff88810f68c730 by task v4l_id/3672

CPU: 0 PID: 3672 Comm: v4l_id Not tainted 6.5.0-rc6-syzkaller-00158-g895ed7eb263d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:475
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 v4l2_fh_init+0x27d/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25
 v4l2_fh_open+0x89/0xc0 drivers/media/v4l2-core/v4l2-fh.c:63
 em28xx_v4l2_open+0x250/0x7e0 drivers/media/usb/em28xx/em28xx-video.c:2153
 v4l2_open+0x226/0x490 drivers/media/v4l2-core/v4l2-dev.c:427
 chrdev_open+0x277/0x700 fs/char_dev.c:414
 do_dentry_open+0x8b2/0x15c0 fs/open.c:914
 do_open fs/namei.c:3636 [inline]
 path_openat+0x19af/0x29c0 fs/namei.c:3793
 do_filp_open+0x1de/0x430 fs/namei.c:3820
 do_sys_openat2+0x176/0x1e0 fs/open.c:1407
 do_sys_open fs/open.c:1422 [inline]
 __do_sys_openat fs/open.c:1438 [inline]
 __se_sys_openat fs/open.c:1433 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1433
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f47a88869a4
Code: 24 20 48 8d 44 24 30 48 89 44 24 28 64 8b 04 25 18 00 00 00 85 c0 75 2c 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 60 48 8b 15 55 a4 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffed4d32d80 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffed4d32f98 RCX: 00007f47a88869a4
RDX: 0000000000000000 RSI: 00007ffed4d33f24 RDI: 00000000ffffff9c
RBP: 00007ffed4d33f24 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffed4d32fb0 R14: 000055dfbba3a670 R15: 00007f47a8ccfa80
 </TASK>

Allocated by task 718:
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x87/0x90 mm/kasan/common.c:383
 kmalloc include/linux/slab.h:582 [inline]
 kzalloc include/linux/slab.h:703 [inline]
 em28xx_v4l2_init+0x114/0x4040 drivers/media/usb/em28xx/em28xx-video.c:2532
 em28xx_init_extension+0x133/0x1f0 drivers/media/usb/em28xx/em28xx-core.c:1116
 request_module_async+0x61/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3405
 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2600
 worker_thread+0x687/0x1110 kernel/workqueue.c:2751
 kthread+0x33a/0x430 kernel/kthread.c:389
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

Freed by task 718:
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x13f/0x190 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:162 [inline]
 slab_free_hook mm/slub.c:1792 [inline]
 slab_free_freelist_hook mm/slub.c:1818 [inline]
 slab_free mm/slub.c:3801 [inline]
 __kmem_cache_free+0xff/0x340 mm/slub.c:3814
 em28xx_free_v4l2 drivers/media/usb/em28xx/em28xx-video.c:2118 [inline]
 kref_put include/linux/kref.h:65 [inline]
 em28xx_v4l2_init+0x228d/0x4040 drivers/media/usb/em28xx/em28xx-video.c:2901
 em28xx_init_extension+0x133/0x1f0 drivers/media/usb/em28xx/em28xx-core.c:1116
 request_module_async+0x61/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3405
 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2600
 worker_thread+0x687/0x1110 kernel/workqueue.c:2751
 kthread+0x33a/0x430 kernel/kthread.c:389
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

The buggy address belongs to the object at ffff88810f68c000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 1840 bytes inside of
 freed 8192-byte region [ffff88810f68c000, ffff88810f68e000)

The buggy address belongs to the physical page:
page:ffffea00043da200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10f688
head:ffffea00043da200 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x200000000010200(slab|head|node=0|zone=2)
page_type: 0xffffffff()
raw: 0200000000010200 ffff888100042280 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080020002 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 5553745885, free_ts 0
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1570
 prep_new_page mm/page_alloc.c:1577 [inline]
 get_page_from_freelist+0x10e1/0x2fd0 mm/page_alloc.c:3221
 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4477
 alloc_page_interleave+0x1e/0x230 mm/mempolicy.c:2125
 alloc_pages+0x22a/0x270 mm/mempolicy.c:2287
 alloc_slab_page mm/slub.c:1862 [inline]
 allocate_slab+0x24e/0x380 mm/slub.c:2009
 new_slab mm/slub.c:2062 [inline]
 ___slab_alloc+0x8bc/0x1570 mm/slub.c:3215
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314
 __slab_alloc_node mm/slub.c:3367 [inline]
 slab_alloc_node mm/slub.c:3460 [inline]
 __kmem_cache_alloc_node+0x132/0x310 mm/slub.c:3509
 __do_kmalloc_node mm/slab_common.c:984 [inline]
 __kmalloc_node+0x4f/0x100 mm/slab_common.c:992
 kmalloc_node include/linux/slab.h:602 [inline]
 kvmalloc_node+0x6f/0x1a0 mm/util.c:604
 kvzalloc_node include/linux/slab.h:724 [inline]
 sbitmap_init_node+0x1c8/0x680 lib/sbitmap.c:113
 scsi_realloc_sdev_budget_map+0x4d4/0x620 drivers/scsi/scsi_scan.c:246
 scsi_alloc_sdev+0x9a9/0xd10 drivers/scsi/scsi_scan.c:356
 scsi_probe_and_add_lun+0x1f92/0x2e90 drivers/scsi/scsi_scan.c:1189
 __scsi_scan_target+0x255/0xc70 drivers/scsi/scsi_scan.c:1676
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88810f68c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810f68c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88810f68c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff88810f68c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810f68c800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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