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AHgh+RrGl6NjSjWaGjgeKcLNwk9WmXQ9bRm3T4eLOCAxBlJFQt5U+hEEaxSY7GIgmpyYejwKBrfU/u7839pVN8M=@vger.kernel.org X-Gm-Message-State: AFuF++lHJi/JrX07pgvm+N6c3GlT4LskS2VG0aZgMqXkaQzmQvL6mnIv 43WvZVxjk02YtYjYiJN9egJ1L8arIYt9idDNF1yxEI5CHDpKCae48Q+2XCeA5R4ioxmTu2nncvH A/LW5isdAXiigK9GCz45hTKtRKFOTVa7kwm99ZR/l2LPJ8/VQH+NqKMcTQlY= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1c0e:b0:486:8a11:6e8b with SMTP id 5614622812f47-4b397f9f538mr1447947b6e.2.1787856804474; Thu, 27 Aug 2026 11:53:24 -0700 (PDT) Date: Thu, 27 Aug 2026 11:53:24 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a9087a4.4d659fcc.734b4.0014.GAE@google.com> Subject: [syzbot] [media?] [usb?] KASAN: slab-use-after-free Read in sd_stopN From: syzbot To: hverkuil@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-usb@vger.kernel.org, mchehab@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 818bebeb63dd drm/xe: Don't hand out the flat CCS storage a.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13fff549580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ccca94d2c01b9e78 dashboard link: https://syzkaller.appspot.com/bug?extid=537b5eb78cebbff5ea70 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b2f979580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-818bebeb.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6e4100526b12/vmlinux-818bebeb.xz kernel image: https://storage.googleapis.com/syzbot-assets/723c4783ee96/bzImage-818bebeb.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+537b5eb78cebbff5ea70@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in sd_stopN+0xaf/0xc0 drivers/media/usb/gspca/ov534_9.c:1615 Read of size 4 at addr ffff8880582fc000 by task syz.2.154/6638 CPU: 1 UID: 0 PID: 6638 Comm: syz.2.154 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 sd_stopN+0xaf/0xc0 drivers/media/usb/gspca/ov534_9.c:1615 gspca_stream_off+0xd5/0x470 drivers/media/usb/gspca/gspca.c:737 gspca_stop_streaming+0x34/0x50 drivers/media/usb/gspca/gspca.c:1365 __vb2_queue_cancel+0xb8/0xe90 drivers/media/common/videobuf2/videobuf2-core.c:2199 vb2_core_streamoff+0x5e/0x140 drivers/media/common/videobuf2/videobuf2-core.c:2376 __vb2_cleanup_fileio.isra.0+0x6e/0x160 drivers/media/common/videobuf2/videobuf2-core.c:2974 vb2_core_queue_release+0x1f/0x190 drivers/media/common/videobuf2/videobuf2-core.c:2676 vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:943 [inline] _vb2_fop_release+0xe8/0x280 drivers/media/common/videobuf2/videobuf2-v4l2.c:1146 v4l2_release+0x280/0x390 drivers/media/v4l2-core/v4l2-dev.c:471 __fput+0x3ff/0xb50 fs/file_table.c:512 task_work_run+0x150/0x240 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x951/0x2ae0 kernel/exit.c:1008 do_group_exit+0xd5/0x2a0 kernel/exit.c:1151 get_signal+0x1ec7/0x21e0 kernel/signal.c:3046 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x139/0x700 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline] do_syscall_64+0x661/0x790 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0daab9e0d9 Code: Unable to access opcode bytes at 0x7f0daab9e0af. RSP: 002b:00007f0daba48028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffe00 RBX: 00007f0daae26090 RCX: 00007f0daab9e0d9 RDX: 0000000000001000 RSI: 0000200000000600 RDI: 0000000000000005 RBP: 00007f0daac35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0daae26128 R14: 00007f0daae26090 R15: 00007ffd25d699f8 Allocated by task 2317: 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:398 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x2e7/0x6b0 mm/slub.c:5484 _kmalloc_noprof include/linux/slab.h:988 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] usb_alloc_dev+0x55/0x1090 drivers/usb/core/usb.c:651 hub_port_connect drivers/usb/core/hub.c:5478 [inline] hub_port_connect_change drivers/usb/core/hub.c:5715 [inline] port_event drivers/usb/core/hub.c:5879 [inline] hub_event+0x2b93/0x4420 drivers/usb/core/hub.c:5961 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387 process_scheduled_works kernel/workqueue.c:3470 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551 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 Freed by task 2317: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2678 [inline] slab_free mm/slub.c:6372 [inline] kfree+0x22b/0x6c0 mm/slub.c:6687 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:3884 hub_port_connect drivers/usb/core/hub.c:5415 [inline] hub_port_connect_change drivers/usb/core/hub.c:5715 [inline] port_event drivers/usb/core/hub.c:5879 [inline] hub_event+0x1bb1/0x4420 drivers/usb/core/hub.c:5961 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387 process_scheduled_works kernel/workqueue.c:3470 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551 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 ffff8880582fc000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 0 bytes inside of freed 2048-byte region [ffff8880582fc000, ffff8880582fc800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880582fa000 pfn:0x582f8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801c042f00 ffffea0000d28010 ffffea0001636a10 raw: ffff8880582fa000 0000000800080006 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88801c042f00 ffffea0000d28010 ffffea0001636a10 head: ffff8880582fa000 0000000800080006 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 5872, tgid 5872 (syz-executor), ts 140556794415 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x110d/0x35b0 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3267 [inline] allocate_slab mm/slub.c:3382 [inline] new_slab+0xa5/0x640 mm/slub.c:3428 refill_objects+0xe3/0x410 mm/slub.c:7305 refill_sheaf mm/slub.c:2805 [inline] __pcs_replace_empty_main+0x372/0x680 mm/slub.c:4677 alloc_from_pcs mm/slub.c:4775 [inline] slab_alloc_node mm/slub.c:4907 [inline] __kmalloc_cache_noprof+0x47b/0x6b0 mm/slub.c:5480 _kmalloc_noprof include/linux/slab.h:988 [inline] rtnl_newlink+0x139/0x2620 net/core/rtnetlink.c:4113 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7132 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg net/socket.c:815 [inline] __sys_sendto+0x48b/0x4e0 net/socket.c:2281 __do_sys_sendto net/socket.c:2288 [inline] __se_sys_sendto net/socket.c:2284 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2284 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5872 tgid 5872 ts 140543763839 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962 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:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4586 [inline] slab_alloc_node mm/slub.c:4919 [inline] __do_kmalloc_node mm/slub.c:5336 [inline] __kvmalloc_node_noprof+0x2ed/0x970 mm/slub.c:6900 netif_alloc_netdev_queues net/core/dev.c:11291 [inline] alloc_netdev_mqs+0xb4e/0x15c0 net/core/dev.c:12187 rtnl_create_link+0xc13/0xf80 net/core/rtnetlink.c:3777 rtnl_newlink_create net/core/rtnetlink.c:3959 [inline] __rtnl_newlink net/core/rtnetlink.c:4098 [inline] rtnl_newlink+0x15bc/0x2620 net/core/rtnetlink.c:4215 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7132 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg net/socket.c:815 [inline] __sys_sendto+0x48b/0x4e0 net/socket.c:2281 __do_sys_sendto net/socket.c:2288 [inline] __se_sys_sendto net/socket.c:2284 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2284 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880582fbf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880582fbf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880582fc000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880582fc080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880582fc100: 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