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smtp.subspace.kernel.org 671BB606A323 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oa1-f70.google.com with SMTP id 586e51a60fabf-44899f99756so14361fac.2 for ; Thu, 22 Oct 2026 09:17:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1792685854; x=1793290654; h=content-transfer-encoding:content-type:to:from:subject:message-id :in-reply-to:date:mime-version:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to:content-type; bh=5HOxdA60brS5/vE87VoiaV9Lf/Ck3aNReGrQMOrjtAc=; b=lq3ofOgEDwXOixL2PxjVpeh0e7UoIQE2EVrbEDvZbocfFM/TYnVVUeRR0CebR+0ygn /Ceptxv5duUmB3HxxFZtFs+ocy9PBEx7JTuSBNzqylQ0+UiPA0aDsIEI0+6rzd5LpF2J EXom/fYkwcY8EyaIfaINDCF9SPG8E6GWiDxdI3cH978kY4foF5rbyJThHXOdNlfvKhHt 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syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [media?] [usb?] kernel BUG in v4l2_device_put Author: neganhat@gmail.com #syz test: linux-next 8f7df005a756 On Thu, Oct 22, 2026 at 9:52=E2=80=AFPM Nh=E1=BA=ADt Anh Nguy=E1=BB=85n Duy= wrote: > > #syz test: linux-next 8f7df005a756 > > On Thu, Oct 22, 2026 at 9:08=E2=80=AFPM syzbot > wrote: > > > > Hello, > > > > syzbot has tested the proposed patch but the reproducer is still trigge= ring an issue: > > KASAN: slab-use-after-free Read in v4l2_release > > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > BUG: KASAN: slab-use-after-free in v4l2_device_supports_requests includ= e/media/v4l2-device.h:252 [inline] > > BUG: KASAN: slab-use-after-free in v4l2_release+0xfe/0x350 drivers/medi= a/v4l2-core/v4l2-dev.c:466 > > Read of size 8 at addr ffff888035785b10 by task v4l_id/7282 > > > > CPU: 1 UID: 0 PID: 7282 Comm: v4l_id Not tainted syzkaller #0 PREEMPT(f= ull) > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS= Google 10/07/2026 > > Call Trace: > > > > dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 > > print_address_description+0x55/0x1e0 mm/kasan/report.c:378 > > print_report+0x58/0x70 mm/kasan/report.c:482 > > kasan_report+0x117/0x150 mm/kasan/report.c:595 > > v4l2_device_supports_requests include/media/v4l2-device.h:252 [inline] > > v4l2_release+0xfe/0x350 drivers/media/v4l2-core/v4l2-dev.c:466 > > __fput+0x408/0xa40 fs/file_table.c:513 > > fput_close_sync+0x11f/0x240 fs/file_table.c:619 > > filp_close_sync fs/open.c:1897 [inline] > > __do_sys_close fs/open.c:2153 [inline] > > __se_sys_close+0xa2/0x160 fs/open.c:2140 > > do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] > > do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > RIP: 0033:0x7f4a56ca7407 > > Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8= fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f = 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff > > RSP: 002b:00007ffcfee18b00 EFLAGS: 00000202 ORIG_RAX: 0000000000000003 > > RAX: ffffffffffffffda RBX: 00007f4a57357880 RCX: 00007f4a56ca7407 > > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 > > RBP: 00007f4a573576e8 R08: 0000000000000000 R09: 0000000000000000 > > R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000013 > > R13: 00007ffcfee18d30 R14: 00007f4a5745c000 R15: 0000557c8543f4d8 > > > > > > Allocated by task 5749: > > kasan_save_stack mm/kasan/common.c:57 [inline] > > kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 > > poison_kmalloc_redzone mm/kasan/common.c:409 [inline] > > __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426 > > kasan_kmalloc include/linux/kasan.h:263 [inline] > > __kmalloc_cache_noprof+0x31c/0x600 mm/slub.c:5680 > > _kmalloc_noprof include/linux/slab.h:991 [inline] > > _kzalloc_noprof include/linux/slab.h:1312 [inline] > > em28xx_media_device_init drivers/media/usb/em28xx/em28xx-cards.c:3757 = [inline] > > em28xx_init_dev+0x857/0x2680 drivers/media/usb/em28xx/em28xx-cards.c:3= 947 > > em28xx_usb_probe+0x17b2/0x2dd0 drivers/media/usb/em28xx/em28xx-cards.c= :4324 > > usb_probe_interface+0x751/0xe00 drivers/usb/core/driver.c:399 > > call_driver_probe drivers/base/dd.c:-1 [inline] > > really_probe+0x254/0xae0 drivers/base/dd.c:707 > > __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:869 > > driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 > > __device_attach_driver+0x270/0x410 drivers/base/dd.c:1027 > > bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:503 > > __device_attach+0x2bd/0x430 drivers/base/dd.c:1131 > > device_initial_probe+0x9c/0x100 drivers/base/dd.c:1190 > > __bus_probe_device+0x126/0x220 drivers/base/bus.c:617 > > device_add+0x7d7/0xb80 drivers/base/core.c:3776 > > usb_set_configuration+0x1bb5/0x2260 drivers/usb/core/message.c:2280 > > usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 > > usb_probe_device+0x1c3/0x3b0 drivers/usb/core/driver.c:293 > > call_driver_probe drivers/base/dd.c:-1 [inline] > > really_probe+0x254/0xae0 drivers/base/dd.c:707 > > __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:869 > > driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 > > __device_attach_driver+0x270/0x410 drivers/base/dd.c:1027 > > bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:503 > > __device_attach+0x2bd/0x430 drivers/base/dd.c:1131 > > device_initial_probe+0x9c/0x100 drivers/base/dd.c:1190 > > __bus_probe_device+0x126/0x220 drivers/base/bus.c:617 > > device_add+0x7d7/0xb80 drivers/base/core.c:3776 > > usb_new_device+0x9aa/0x1690 drivers/usb/core/hub.c:2713 > > hub_port_connect drivers/usb/core/hub.c:5585 [inline] > > hub_port_connect_change drivers/usb/core/hub.c:5725 [inline] > > port_event drivers/usb/core/hub.c:5889 [inline] > > hub_event+0x28e8/0x4d30 drivers/usb/core/hub.c:5971 > > process_one_work kernel/workqueue.c:3495 [inline] > > process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578 > > worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659 > > kthread+0x38b/0x480 kernel/kthread.c:436 > > ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 > > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > > > Freed by task 5749: > > kasan_save_stack mm/kasan/common.c:57 [inline] > > kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 > > kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 > > poison_slab_object mm/kasan/common.c:264 [inline] > > __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296 > > kasan_slab_free include/linux/kasan.h:235 [inline] > > slab_free_hook mm/slub.c:2780 [inline] > > slab_free mm/slub.c:6630 [inline] > > kfree+0x1c5/0x650 mm/slub.c:6923 > > em28xx_unregister_media_device drivers/media/usb/em28xx/em28xx-cards.c= :3779 [inline] > > em28xx_release_resources+0xde/0x240 drivers/media/usb/em28xx/em28xx-ca= rds.c:3798 > > em28xx_usb_disconnect+0x19f/0x2f0 drivers/media/usb/em28xx/em28xx-card= s.c:4493 > > usb_unbind_interface+0x295/0x9c0 drivers/usb/core/driver.c:460 > > device_remove drivers/base/dd.c:619 [inline] > > __device_release_driver drivers/base/dd.c:1357 [inline] > > device_release_driver_internal+0x48d/0x7d0 drivers/base/dd.c:1380 > > bus_remove_device+0x444/0x560 drivers/base/bus.c:681 > > device_del+0x524/0x8f0 drivers/base/core.c:3965 > > usb_disable_device+0x3d4/0x8d0 drivers/usb/core/message.c:1484 > > usb_disconnect+0x346/0x9a0 drivers/usb/core/hub.c:2355 > > hub_port_connect drivers/usb/core/hub.c:5425 [inline] > > hub_port_connect_change drivers/usb/core/hub.c:5725 [inline] > > port_event drivers/usb/core/hub.c:5889 [inline] > > hub_event+0x1bbb/0x4d30 drivers/usb/core/hub.c:5971 > > process_one_work kernel/workqueue.c:3495 [inline] > > process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578 > > worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659 > > kthread+0x38b/0x480 kernel/kthread.c:436 > > ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 > > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > > > The buggy address belongs to the object at ffff888035785800 > > which belongs to the cache kmalloc-1k of size 1024 > > The buggy address is located 784 bytes inside of > > freed 1024-byte region [ffff888035785800, ffff888035785c00) > > > > The buggy address belongs to the physical page: > > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x35= 780 > > head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 > > flags: 0xfff00000000040(head|node=3D0|zone=3D1|lastcpupid=3D0x7ff) > > page_type: f5(slab) > > raw: 00fff00000000040 ffff88813ff2bdc0 dead000000000100 dead00000000012= 2 > > raw: 0000000000000000 0000000000100010 00000000f5000000 000000000000000= 0 > > head: 00fff00000000040 ffff88813ff2bdc0 dead000000000100 dead0000000001= 22 > > head: 0000000000000000 0000000000100010 00000000f5000000 00000000000000= 00 > > head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffff= ff > > head: ffffffffffffffff 0000000000000000 00000000ffffffff 00000000000000= 08 > > page dumped because: kasan: bad access detected > > page_owner tracks the page as allocated > > page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd282= 0(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1= 62, tgid 162 (kworker/u8:7), ts 176383093465 > > set_page_owner include/linux/page_owner.h:33 [inline] > > post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1856 > > prep_new_page mm/page_alloc.c:1864 [inline] > > get_page_from_freelist+0x220f/0x2280 mm/page_alloc.c:3935 > > __alloc_frozen_pages_noprof+0x1fe/0x410 mm/page_alloc.c:5459 > > alloc_slab_page mm/slub.c:3384 [inline] > > allocate_slab+0x7d/0x5e0 mm/slub.c:3499 > > new_slab mm/slub.c:3550 [inline] > > refill_objects+0x2d5/0x350 mm/slub.c:7539 > > refill_sheaf mm/slub.c:2917 [inline] > > __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4811 > > alloc_from_pcs mm/slub.c:4887 [inline] > > slab_alloc_node mm/slub.c:5021 [inline] > > __do_kmalloc_node mm/slub.c:5530 [inline] > > __kmalloc_noprof+0x476/0x710 mm/slub.c:5556 > > _kmalloc_noprof include/linux/slab.h:995 [inline] > > _kzalloc_noprof include/linux/slab.h:1312 [inline] > > ieee802_11_parse_elems_full+0x14b/0x2a10 net/mac80211/parse.c:1077 > > ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2583 [inline] > > ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1542 [inline] > > ieee80211_ibss_rx_queued_mgmt+0x509/0x2c40 net/mac80211/ibss.c:1573 > > ieee80211_iface_process_skb net/mac80211/iface.c:1805 [inline] > > ieee80211_iface_work+0x769/0xfa0 net/mac80211/iface.c:1859 > > cfg80211_wiphy_work+0x29e/0x420 net/wireless/core.c:610 > > process_one_work kernel/workqueue.c:3495 [inline] > > process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578 > > worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659 > > kthread+0x38b/0x480 kernel/kthread.c:436 > > ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 > > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > page last free pid 31 tgid 31 ts 176051931514 stack trace: > > reset_page_owner include/linux/page_owner.h:26 [inline] > > __free_pages_prepare mm/page_alloc.c:1403 [inline] > > __free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2954 > > __slab_free+0x269/0x2c0 mm/slub.c:5926 > > qlink_free mm/kasan/quarantine.c:163 [inline] > > qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 > > kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 > > __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:361 > > kasan_slab_alloc include/linux/kasan.h:253 [inline] > > slab_post_alloc_hook mm/slub.c:4720 [inline] > > slab_alloc_node mm/slub.c:5033 [inline] > > __kmalloc_cache_noprof+0x29a/0x600 mm/slub.c:5676 > > _kmalloc_noprof include/linux/slab.h:991 [inline] > > dummy_urb_enqueue+0x7c/0x7a0 drivers/usb/gadget/udc/dummy_hcd.c:1327 > > usb_hcd_submit_urb+0x328/0x1b60 drivers/usb/core/hcd.c:1543 > > usb_start_wait_urb+0x13f/0x5b0 drivers/usb/core/message.c:62 > > usb_internal_control_msg drivers/usb/core/message.c:117 [inline] > > usb_control_msg+0x234/0x3e0 drivers/usb/core/message.c:167 > > get_bMaxPacketSize0 drivers/usb/core/hub.c:4869 [inline] > > hub_port_init+0xb0b/0x28c0 drivers/usb/core/hub.c:5065 > > hub_port_connect drivers/usb/core/hub.c:5514 [inline] > > hub_port_connect_change drivers/usb/core/hub.c:5725 [inline] > > port_event drivers/usb/core/hub.c:5889 [inline] > > hub_event+0x24e8/0x4d30 drivers/usb/core/hub.c:5971 > > process_one_work kernel/workqueue.c:3495 [inline] > > process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578 > > worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659 > > kthread+0x38b/0x480 kernel/kthread.c:436 > > ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 > > > > Memory state around the buggy address: > > ffff888035785a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ffff888035785a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > >ffff888035785b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ^ > > ffff888035785b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ffff888035785c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > > > > Tested on: > > > > commit: 8f7df005 Add linux-next specific files for 20261020 > > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/next/linu= x-next.git > > console output: https://syzkaller.appspot.com/x/log.txt?x=3D120a9fa9580= 000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=3D9c1b9b13e3e= 4ce1a > > dashboard link: https://syzkaller.appspot.com/bug?extid=3D809dfc586f33f= c44b6ac > > compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.= 1.8 > > patch: https://syzkaller.appspot.com/x/patch.diff?x=3D17b7b50d= 580000 > >