From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f80.google.com (mail-ot1-f80.google.com [209.85.210.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F41093A4F5E for ; Sun, 9 Aug 2026 19:13:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786302824; cv=none; b=iF7/kFoeZ5l9IGkgZ2+NTbMEJlr4CAiZwd2XTV5CJuAO+FS42bpYgelcTpS4QyXEfuUpIrEQ9tAquCZL/sWkNtiwYX3rPd/Te5mYBXcmTlT1Y5lqr2HoSzOJoss/ZT4D0Dk6v5XPJEwDiZXOsIr3UiW8cLgRqA5SvKGqYDclCyI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786302824; c=relaxed/simple; bh=YlUozqL+pNCTPZjh0WOpVKZ09K4EJPn8LY5CZInsdS4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=7DxYcKDooR4FwgKlCxuoRI/oVR2/Ow72rmZBy2HjH1s=; b=i3J+cu/93Xv/ejWAt7GpUeb/pKuKY32dgAa5nx08FyKjTWB4+ze0rtzl6zPlaOpnL+ HCWSXmG/bdLgWSL8NtSoUWTGkBI4LUMhtfpc3t9urqhgztwD8mSxQsBATLlzSLX2YCYz KtVyxTXyIeiwUUgu9O19gyQTzYHKI7YMI8zqGj/GMuuYxRB/W8rxdGkgBR+ST7pxziGJ bCCYxytzLNQpJTQ2AgGI5oU1oet0bADToTjr7XGocoS+nZCZ8OdtecUne05HXol5zRHP +NcjwAw1uaxp01IVa/jp4z0QBF8vIXRDd0G8x88CdW4cEWEWZvNxxtAhqhYK5K4gkotS jfCQ== X-Gm-Message-State: AOJu0YzwmvIR6mD5pyFlKVYe6Uwcf4vjjIx+mfoERZagDyTxMgYoeSOw FtTXShDafRCEn6rZLreBt8G28L1jKt0qAjA5CgEOSq6+2HYEVF8eKm2oz4oVeB6ldjHNCTbJqzV 841/qnC+kpH4a9Exl/MW9qE8233vtbEzbxhrQ+VFT5MzVXfTgvnJ6/XRXI2RKKQ== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:188e:b0:6ae:4767:a503 with SMTP id 006d021491bc7-6b035405ca2mr9166107eaf.34.1786302816602; Sun, 09 Aug 2026 12:13:36 -0700 (PDT) Date: Sun, 09 Aug 2026 12:13:36 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a78d160.01d0871a.3a0d52.0092.GAE@google.com> Subject: [syzbot] [media?] [usb?] WARNING in ttusb_dec_start_feed From: syzbot To: 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: ba5cc80fd326 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=1702bfb9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ccf4bea59f67007 dashboard link: https://syzkaller.appspot.com/bug?extid=e1dbaae5eefaa2dfbc35 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13af6fb9580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c56132580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/959ad5f4e730/disk-ba5cc80f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0787d25f251e/vmlinux-ba5cc80f.xz kernel image: https://storage.googleapis.com/syzbot-assets/2e85c36fabac/Image-ba5cc80f.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e1dbaae5eefaa2dfbc35@syzkaller.appspotmail.com usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 ------------[ cut here ]------------ memcpy: detected buffer overflow: 75 byte read of buffer size 60 WARNING: lib/string_helpers.c:1037 at __fortify_report+0xa0/0xb8 lib/string_helpers.c:1036, CPU#1: kworker/1:3/4388 Modules linked in: CPU: 1 UID: 0 PID: 4388 Comm: kworker/1:3 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 Workqueue: usb_hub_wq hub_event pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __fortify_report+0xa0/0xb8 lib/string_helpers.c:1036 lr : __fortify_report+0xa0/0xb8 lib/string_helpers.c:1036 sp : ffff800094c46d20 x29: ffff800094c46d20 x28: dfff800000000000 x27: ffff700012988db0 x26: 0000000000000000 x25: ffff0000d18d4983 x24: ffff800094c46ea0 x23: 000000000000004b x22: ffff800086cec898 x21: 0000000000000000 x20: 000000000000004b x19: 000000000000003c x18: 1fffe00034bbbe28 x17: 0000000000000003 x16: ffff800088b27000 x15: ffff8000824ebed4 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000002 x9 : 96b32e65f1701e00 x8 : 96b32e65f1701e00 x7 : ffff80008048e8f8 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f8870 x2 : 0000000100000000 x1 : ffff0000c70e1d40 x0 : 0000000000000000 Call trace: __fortify_report+0xa0/0xb8 lib/string_helpers.c:1036 (P) __fortify_panic+0x10/0x14 lib/string_helpers.c:1043 fortify_memcpy_chk include/linux/fortify-string.h:549 [inline] ttusb_dec_start_feed+0x0/0x10ac drivers/media/usb/ttusb-dec/ttusb_dec.c:372 ttusb_dec_get_stb_state drivers/media/usb/ttusb-dec/ttusb_dec.c:392 [inline] ttusb_dec_init_stb drivers/media/usb/ttusb-dec/ttusb_dec.c:1413 [inline] ttusb_dec_probe+0x724/0x1aa0 drivers/media/usb/ttusb-dec/ttusb_dec.c:1671 usb_probe_interface+0x308/0x788 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x29c/0x800 drivers/base/dd.c:706 __driver_probe_device+0x1e0/0x350 drivers/base/dd.c:868 driver_probe_device+0x6c/0x19c drivers/base/dd.c:898 __device_attach_driver+0x198/0x2f8 drivers/base/dd.c:1026 bus_for_each_drv+0x144/0x1dc drivers/base/bus.c:500 __device_attach+0x248/0x390 drivers/base/dd.c:1098 device_initial_probe+0x90/0xc8 drivers/base/dd.c:1153 bus_probe_device+0x58/0x120 drivers/base/bus.c:620 device_add+0x6cc/0x9e0 drivers/base/core.c:3772 usb_set_configuration+0x1184/0x158c drivers/usb/core/message.c:2268 usb_generic_driver_probe+0x8c/0x148 drivers/usb/core/generic.c:250 usb_probe_device+0x114/0x2b0 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x29c/0x800 drivers/base/dd.c:706 __driver_probe_device+0x1e0/0x350 drivers/base/dd.c:868 driver_probe_device+0x6c/0x19c drivers/base/dd.c:898 __device_attach_driver+0x198/0x2f8 drivers/base/dd.c:1026 bus_for_each_drv+0x144/0x1dc drivers/base/bus.c:500 __device_attach+0x248/0x390 drivers/base/dd.c:1098 device_initial_probe+0x90/0xc8 drivers/base/dd.c:1153 bus_probe_device+0x58/0x120 drivers/base/bus.c:620 device_add+0x6cc/0x9e0 drivers/base/core.c:3772 usb_new_device+0x9bc/0x11f0 drivers/usb/core/hub.c:2695 hub_port_connect drivers/usb/core/hub.c:5567 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x1ef0/0x39fc drivers/usb/core/hub.c:5953 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0x788/0x10b8 kernel/workqueue.c:3405 worker_thread+0x798/0xbd0 kernel/workqueue.c:3486 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838 irq event stamp: 7958 hardirqs last enabled at (7957): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (7957): [] arm64_exit_to_kernel_mode+0x80/0x94 arch/arm64/kernel/entry-common.c:62 hardirqs last disabled at (7958): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:425 softirqs last enabled at (7892): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (7892): [] handle_softirqs+0xc28/0xd98 kernel/softirq.c:650 softirqs last disabled at (7883): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ kernel BUG at lib/string_helpers.c:1044! Internal error: Oops - BUG: 00000000f2000800 [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 4388 Comm: kworker/1:3 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 Workqueue: usb_hub_wq hub_event pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __fortify_panic+0x10/0x14 lib/string_helpers.c:1043 lr : __fortify_panic+0x10/0x14 lib/string_helpers.c:1043 sp : ffff800094c46d50 x29: ffff800094c46d50 x28: dfff800000000000 x27: ffff700012988db0 x26: 0000000000000000 x25: ffff0000d18d4983 x24: ffff800094c46ea0 x23: 000000000000004b x22: 000000000000004b x21: ffff0000d18d4980 x20: 1fffe0001a31a930 x19: ffff0000dd4bc000 x18: 1fffe00034bbbe28 x17: 0000000000000003 x16: ffff800088b27000 x15: ffff8000824ebed4 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000002 x9 : 96b32e65f1701e00 x8 : 96b32e65f1701e00 x7 : ffff80008048e8f8 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f8870 x2 : 0000000100000000 x1 : ffff0000c70e1d40 x0 : 0000000000000000 Call trace: __fortify_panic+0x10/0x14 lib/string_helpers.c:1043 (P) fortify_memcpy_chk include/linux/fortify-string.h:549 [inline] ttusb_dec_start_feed+0x0/0x10ac drivers/media/usb/ttusb-dec/ttusb_dec.c:372 ttusb_dec_get_stb_state drivers/media/usb/ttusb-dec/ttusb_dec.c:392 [inline] ttusb_dec_init_stb drivers/media/usb/ttusb-dec/ttusb_dec.c:1413 [inline] ttusb_dec_probe+0x724/0x1aa0 drivers/media/usb/ttusb-dec/ttusb_dec.c:1671 usb_probe_interface+0x308/0x788 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x29c/0x800 drivers/base/dd.c:706 __driver_probe_device+0x1e0/0x350 drivers/base/dd.c:868 driver_probe_device+0x6c/0x19c drivers/base/dd.c:898 __device_attach_driver+0x198/0x2f8 drivers/base/dd.c:1026 bus_for_each_drv+0x144/0x1dc drivers/base/bus.c:500 __device_attach+0x248/0x390 drivers/base/dd.c:1098 device_initial_probe+0x90/0xc8 drivers/base/dd.c:1153 bus_probe_device+0x58/0x120 drivers/base/bus.c:620 device_add+0x6cc/0x9e0 drivers/base/core.c:3772 usb_set_configuration+0x1184/0x158c drivers/usb/core/message.c:2268 usb_generic_driver_probe+0x8c/0x148 drivers/usb/core/generic.c:250 usb_probe_device+0x114/0x2b0 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x29c/0x800 drivers/base/dd.c:706 __driver_probe_device+0x1e0/0x350 drivers/base/dd.c:868 driver_probe_device+0x6c/0x19c drivers/base/dd.c:898 __device_attach_driver+0x198/0x2f8 drivers/base/dd.c:1026 bus_for_each_drv+0x144/0x1dc drivers/base/bus.c:500 __device_attach+0x248/0x390 drivers/base/dd.c:1098 device_initial_probe+0x90/0xc8 drivers/base/dd.c:1153 bus_probe_device+0x58/0x120 drivers/base/bus.c:620 device_add+0x6cc/0x9e0 drivers/base/core.c:3772 usb_new_device+0x9bc/0x11f0 drivers/usb/core/hub.c:2695 hub_port_connect drivers/usb/core/hub.c:5567 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x1ef0/0x39fc drivers/usb/core/hub.c:5953 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0x788/0x10b8 kernel/workqueue.c:3405 worker_thread+0x798/0xbd0 kernel/workqueue.c:3486 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838 Code: d503233f a9bf7bfd 910003fd 94619c95 (d4210000) ---[ end trace 0000000000000000 ]--- --- 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