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Sun, 01 Nov 2026 10:26:32 -0800 (PST) Date: Sun, 01 Nov 2026 10:26:32 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ae78458.64e51036.15cf6a.0015.GAE@google.com> Subject: [syzbot] [media?] [usb?] KASAN: slab-use-after-free Read in dev_dbg_obj From: syzbot To: laurent.pinchart@ideasonboard.com, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-usb@vger.kernel.org, mchehab@kernel.org, sakari.ailus@linux.intel.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: cbbddb6b08cc Merge tag 'power-utilities-2026.10.31' of git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11fc0581580000 kernel config: https://syzkaller.appspot.com/x/.config?x=bd712e5dbce1d1a0 dashboard link: https://syzkaller.appspot.com/bug?extid=54648a6c1187a7ef46a6 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12f0e62d580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-cbbddb6b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4e9212cb9d41/vmlinux-cbbddb6b.xz kernel image: https://storage.googleapis.com/syzbot-assets/b7710a90cc0c/bzImage-cbbddb6b.xz AI-generated root cause summary: In drivers/media/usb/em28xx/em28xx-video.c, if em28xx_v4l2_init() fails after registering video devices (e.g. during v4l2_mc_create_media_graph()) while userspace concurrently holds an open file handle to a video device node, unregister_dev drops the initial v4l2_dev reference but leaves dev->v4l2 non-NULL. When the device disconnects, em28xx_v4l2_fini() is called and incorrectly drops the initial reference a second time via v4l2_device_put(&v4l2->v4l2_dev). This refcount underflow causes em28xx_free_v4l2() to free struct em28xx_v4l2 prematurely, resulting in a slab use-after-free when userspace closes the file descriptor and v4l2_device_release() accesses embedded media entities. full analysis: https://syzkaller.appspot.com/x/ai_root_cause?x=54648a6c1187a7ef46a6 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+54648a6c1187a7ef46a6@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in media_type include/media/media-entity.h:443 [inline] BUG: KASAN: slab-use-after-free in dev_dbg_obj+0x630/0x830 drivers/media/mc/mc-entity.c:96 Read of size 4 at addr ffff888023601bd0 by task v4l_id/6384 CPU: 2 UID: 0 PID: 6384 Comm: v4l_id Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 media_type include/media/media-entity.h:443 [inline] dev_dbg_obj+0x630/0x830 drivers/media/mc/mc-entity.c:96 media_gobj_destroy drivers/media/mc/mc-entity.c:179 [inline] media_gobj_destroy+0x4d/0x240 drivers/media/mc/mc-entity.c:173 __media_device_unregister_entity+0x20c/0x2f0 drivers/media/mc/mc-device.c:597 media_device_unregister_entity+0x4b/0x70 drivers/media/mc/mc-device.c:677 v4l2_device_release+0x363/0x480 drivers/media/v4l2-core/v4l2-dev.c:208 device_release+0xd2/0x270 drivers/base/core.c:2640 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1f7/0x640 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3886 video_put drivers/media/v4l2-core/v4l2-dev.c:173 [inline] v4l2_release+0x2da/0x390 drivers/media/v4l2-core/v4l2-dev.c:480 __fput+0x3fb/0xb50 fs/file_table.c:512 fput_close_sync+0x118/0x250 fs/file_table.c:618 filp_close_sync+0x75/0xa0 fs/open.c:1573 __do_sys_close fs/open.c:1596 [inline] __se_sys_close fs/open.c:1583 [inline] __x64_sys_close+0x81/0x110 fs/open.c:1583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x121/0x770 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb504ca7407 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:00007ffe26ad6260 EFLAGS: 00000202 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 00007fb5053c2880 RCX: 00007fb504ca7407 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007fb5053c26e8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000013 R13: 00007ffe26ad6490 R14: 00007fb505529000 R15: 0000564e446754d8 Allocated by task 34: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x2f8/0x6d0 mm/slub.c:5680 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] em28xx_v4l2_init.cold+0x94/0x3a7f drivers/media/usb/em28xx/em28xx-video.c:2751 em28xx_init_extension+0x13a/0x200 drivers/media/usb/em28xx/em28xx-core.c:1245 request_module_async+0x1e/0x30 drivers/media/usb/em28xx/em28xx-cards.c:3723 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3495 process_scheduled_works kernel/workqueue.c:3578 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3659 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 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 ffff888023600000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 7120 bytes inside of freed 8192-byte region [ffff888023600000, ffff888023602000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23600 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801d443180 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801d443180 dead000000000100 dead000000000122 head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 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 5812, tgid 5812 (syz-executor), ts 73629010596 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1856 prep_new_page mm/page_alloc.c:1864 [inline] get_page_from_freelist+0x1113/0x35e0 mm/page_alloc.c:3935 __alloc_frozen_pages_noprof+0x2bd/0x3280 mm/page_alloc.c:5444 alloc_slab_page mm/slub.c:3384 [inline] allocate_slab mm/slub.c:3499 [inline] new_slab+0xb1/0x6d0 mm/slub.c:3550 refill_objects+0xe3/0x410 mm/slub.c:7539 refill_sheaf mm/slub.c:2917 [inline] __pcs_replace_empty_main+0x35e/0x650 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+0x677/0x840 mm/slub.c:5556 _kmalloc_noprof include/linux/slab.h:995 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] ops_init+0x77/0x5f0 net/core/net_namespace.c:127 setup_net+0x118/0x3a0 net/core/net_namespace.c:443 copy_net_ns+0x340/0x7a0 net/core/net_namespace.c:584 create_new_namespaces+0x3ea/0xac0 kernel/nsproxy.c:132 unshare_nsproxy_namespaces+0xf6/0x210 kernel/nsproxy.c:234 ksys_unshare+0x44f/0x980 kernel/fork.c:3298 __do_sys_unshare kernel/fork.c:3364 [inline] __se_sys_unshare kernel/fork.c:3362 [inline] __ia32_sys_unshare+0x30/0x40 kernel/fork.c:3362 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline] __do_fast_syscall_32+0x14b/0x8c0 arch/x86/entry/syscall_32.c:282 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:307 page last free pid 5501 tgid 5501 ts 24218447288 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1403 [inline] __free_frozen_pages+0x7b4/0x1110 mm/page_alloc.c:2954 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 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] kmem_cache_alloc_node_noprof+0x282/0x6e0 mm/slub.c:5105 __alloc_skb+0x140/0x710 net/core/skbuff.c:705 alloc_skb include/linux/skbuff.h:1390 [inline] alloc_skb_with_frags+0xdb/0x750 net/core/skbuff.c:6898 sock_alloc_send_pskb+0x86a/0x9e0 net/core/sock.c:3093 unix_dgram_sendmsg+0x3f4/0x1a80 net/unix/af_unix.c:2148 unix_seqpacket_sendmsg+0x12a/0x1d0 net/unix/af_unix.c:2549 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg net/socket.c:818 [inline] sock_write_iter+0x560/0x5d0 net/socket.c:1269 do_iter_readv_writev+0x6f7/0x930 fs/read_write.c:828 vfs_writev+0x360/0xdd0 fs/read_write.c:1058 do_writev+0x28a/0x340 fs/read_write.c:1104 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x121/0x770 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888023601a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888023601b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888023601b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888023601c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888023601c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup