On Mon, Dec 16, 2019 at 2:15 PM syzbot <syzbot+0a5c96772a9b26f2a876@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 4cc037ec usb: gadget: add raw-gadget interface > git tree: https://github.com/google/kasan.git usb-fuzzer > console output: https://syzkaller.appspot.com/x/log.txt?x=11b905dee00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e9c2b6de462bc469 > dashboard link: https://syzkaller.appspot.com/bug?extid=0a5c96772a9b26f2a876 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10f82546e00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1638ef7ee00000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+0a5c96772a9b26f2a876@xxxxxxxxxxxxxxxxxxxxxxxxx > > usb 1-1: New USB device found, idVendor=0bd3, idProduct=0755, > bcdDevice=69.6a > usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 > usb 1-1: config 0 descriptor?? > usb 1-1: string descriptor 0 read error: -71 > uvcvideo: Found UVC 0.00 device <unnamed> (0bd3:0755) > ------------[ cut here ]------------ > list_add double add: new=ffff8881d0637010, prev=ffff8881d0637010, > next=ffff8881d4e87c18. > WARNING: CPU: 1 PID: 22 at lib/list_debug.c:29 __list_add_valid+0xb4/0xf0 > lib/list_debug.c:29 > Kernel panic - not syncing: panic_on_warn set ... > CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 5.5.0-rc1-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Workqueue: usb_hub_wq hub_event > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0xef/0x16e lib/dump_stack.c:118 > panic+0x2aa/0x6e1 kernel/panic.c:221 > __warn.cold+0x2f/0x30 kernel/panic.c:582 > report_bug+0x27b/0x2f0 lib/bug.c:195 > fixup_bug arch/x86/kernel/traps.c:174 [inline] > fixup_bug arch/x86/kernel/traps.c:169 [inline] > do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:267 > do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286 > invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 > RIP: 0010:__list_add_valid+0xb4/0xf0 lib/list_debug.c:29 > Code: 48 c7 c7 e0 f3 da 85 4c 89 e6 e8 ef cf 2b ff 0f 0b 31 c0 eb c5 48 89 > f2 4c 89 e1 48 89 ee 48 c7 c7 60 f4 da 85 e8 d4 cf 2b ff <0f> 0b 31 c0 eb > aa 48 89 34 24 e8 fd 3c 7f ff 48 8b 34 24 e9 60 ff > RSP: 0018:ffff8881d8c37080 EFLAGS: 00010286 > RAX: 0000000000000000 RBX: ffff8881d0637010 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffffffff81295dad RDI: ffffed103b186e02 > RBP: ffff8881d0637010 R08: ffff8881da24e200 R09: fffffbfff11f1eae > R10: fffffbfff11f1ead R11: ffffffff88f8f56f R12: ffff8881d4e87c18 > R13: ffff8881d0637000 R14: dffffc0000000000 R15: ffff8881d4e87c18 > __list_add include/linux/list.h:60 [inline] > list_add_tail include/linux/list.h:93 [inline] > uvc_scan_chain_forward.isra.0+0x4df/0x637 > drivers/media/usb/uvc/uvc_driver.c:1526 > uvc_scan_chain drivers/media/usb/uvc/uvc_driver.c:1640 [inline] > uvc_scan_device drivers/media/usb/uvc/uvc_driver.c:1824 [inline] > uvc_probe.cold+0x1aee/0x29de drivers/media/usb/uvc/uvc_driver.c:2197 > usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 > really_probe+0x281/0x6d0 drivers/base/dd.c:548 > driver_probe_device+0x104/0x210 drivers/base/dd.c:721 > __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 > bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 > __device_attach+0x217/0x360 drivers/base/dd.c:894 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 > device_add+0x1480/0x1c20 drivers/base/core.c:2487 > usb_set_configuration+0xe67/0x1740 drivers/usb/core/message.c:2023 > generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 > usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266 > really_probe+0x281/0x6d0 drivers/base/dd.c:548 > driver_probe_device+0x104/0x210 drivers/base/dd.c:721 > __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 > bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 > __device_attach+0x217/0x360 drivers/base/dd.c:894 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 > device_add+0x1480/0x1c20 drivers/base/core.c:2487 > usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2537 > hub_port_connect drivers/usb/core/hub.c:5184 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] > port_event drivers/usb/core/hub.c:5470 [inline] > hub_event+0x1e59/0x3860 drivers/usb/core/hub.c:5552 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2264 > worker_thread+0x96/0xe20 kernel/workqueue.c:2410 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > This bug 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@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches #syz fix: media: uvc: Avoid cyclic entity chains due to malformed USB descriptors
