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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 ffff8881066e0730 by task v4l_id/3099

CPU: 0 PID: 3099 Comm: v4l_id Not tainted 6.4.0-rc5-syzkaller-00265-ge4cf7f195d60 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351
 print_report mm/kasan/report.c:462 [inline]
 kasan_report+0x11c/0x130 mm/kasan/report.c:572
 v4l2_fh_init+0x27d/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25
 v4l2_fh_open+0x8c/0xc0 drivers/media/v4l2-core/v4l2-fh.c:63
 em28xx_v4l2_open+0x24a/0x7f0 drivers/media/usb/em28xx/em28xx-video.c:2153
 v4l2_open+0x220/0x480 drivers/media/v4l2-core/v4l2-dev.c:427
 chrdev_open+0x26a/0x770 fs/char_dev.c:414
 do_dentry_open+0x6c7/0x12a0 fs/open.c:920
 do_open fs/namei.c:3636 [inline]
 path_openat+0x1baa/0x2750 fs/namei.c:3791
 do_filp_open+0x1ba/0x410 fs/namei.c:3818
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1356
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0x143/0x1f0 fs/open.c:1383
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd6faf3f9a4
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:00007ffcf0d100f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffcf0d10308 RCX: 00007fd6faf3f9a4
RDX: 0000000000000000 RSI: 00007ffcf0d10f25 RDI: 00000000ffffff9c
RBP: 00007ffcf0d10f25 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcf0d10320 R14: 00005571f5242670 R15: 00007fd6fb388a80
 </TASK>

Allocated by task 700:
 kasan_save_stack+0x22/0x40 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+0x7b/0x90 mm/kasan/common.c:383
 kmalloc include/linux/slab.h:559 [inline]
 kzalloc include/linux/slab.h:680 [inline]
 em28xx_v4l2_init drivers/media/usb/em28xx/em28xx-video.c:2532 [inline]
 em28xx_v4l2_init+0x128/0x3ea0 drivers/media/usb/em28xx/em28xx-video.c:2510
 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+0x99a/0x15e0 kernel/workqueue.c:2405
 process_scheduled_works kernel/workqueue.c:2468 [inline]
 worker_thread+0x830/0x10c0 kernel/workqueue.c:2557
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Freed by task 700:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x144/0x1b0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:162 [inline]
 slab_free_hook mm/slub.c:1781 [inline]
 slab_free_freelist_hook mm/slub.c:1807 [inline]
 slab_free mm/slub.c:3786 [inline]
 __kmem_cache_free+0x99/0x320 mm/slub.c:3799
 em28xx_free_v4l2 drivers/media/usb/em28xx/em28xx-video.c:2118 [inline]
 kref_put include/linux/kref.h:65 [inline]
 em28xx_v4l2_init drivers/media/usb/em28xx/em28xx-video.c:2901 [inline]
 em28xx_v4l2_init+0xd5e/0x3ea0 drivers/media/usb/em28xx/em28xx-video.c:2510
 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+0x99a/0x15e0 kernel/workqueue.c:2405
 process_scheduled_works kernel/workqueue.c:2468 [inline]
 worker_thread+0x830/0x10c0 kernel/workqueue.c:2557
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

The buggy address belongs to the object at ffff8881066e0000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 1840 bytes inside of
 freed 8192-byte region [ffff8881066e0000, ffff8881066e2000)

The buggy address belongs to the physical page:
page:ffffea000419b800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1066e0
head:ffffea000419b800 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x200000000010200(slab|head|node=0|zone=2)
page_type: 0xffffffff()
raw: 0200000000010200 ffff888100042280 ffffea000419b000 dead000000000003
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 5356855687, free_ts 0
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1731
 prep_new_page mm/page_alloc.c:1738 [inline]
 get_page_from_freelist+0x13a1/0x2aa0 mm/page_alloc.c:3502
 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4768
 alloc_page_interleave+0x1e/0x1e0 mm/mempolicy.c:2112
 alloc_pages+0x233/0x270 mm/mempolicy.c:2274
 alloc_slab_page mm/slub.c:1851 [inline]
 allocate_slab+0x25f/0x390 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3192
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3291
 __slab_alloc_node mm/slub.c:3344 [inline]
 slab_alloc_node mm/slub.c:3441 [inline]
 __kmem_cache_alloc_node+0x291/0x2d0 mm/slub.c:3490
 __do_kmalloc_node mm/slab_common.c:965 [inline]
 __kmalloc+0x4e/0x190 mm/slab_common.c:979
 kmalloc include/linux/slab.h:563 [inline]
 acpi_os_allocate include/acpi/platform/aclinuxex.h:52 [inline]
 acpi_ut_initialize_buffer+0x135/0x200 drivers/acpi/acpica/utalloc.c:327
 acpi_rs_create_pci_routing_table+0x109/0x9e0 drivers/acpi/acpica/rscreate.c:212
 acpi_rs_get_prt_method_data+0x9e/0xf0 drivers/acpi/acpica/rsutils.c:456
 acpi_get_irq_routing_table+0xbb/0xf0 drivers/acpi/acpica/rsxface.c:137
 acpi_pci_irq_find_prt_entry+0x18a/0xe10 drivers/acpi/pci_irq.c:214
 acpi_pci_irq_lookup+0x85/0x740 drivers/acpi/pci_irq.c:298
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881066e0600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881066e0680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881066e0700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff8881066e0780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881066e0800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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