Hello,

syzbot found the following issue on:

HEAD commit: 15ac8fdb Add linux-next specific files for 20201207 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=16d4620f500000 kernel config: https://syzkaller.appspot.com/x/.config?x=3696b8138207d24d dashboard link: https://syzkaller.appspot.com/bug?extid=df7dc146ebdd6435eea3 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=126afa13500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14389613500000

IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+df7dc146ebdd6435eea3@syzkaller.appspotmail.com

usb 1-1: New USB device found, idVendor=1d6b, idProduct=0101, bcdDevice= 0.40 usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-1: Product: syz usb 1-1: Manufacturer: syz usb 1-1: SerialNumber: syz usb 1-1: 2:1 : no or invalid class specific endpoint descriptor ================================================================================ UBSAN: shift-out-of-bounds in sound/usb/format.c:44:17 shift exponent 4098 is too large for 64-bit type 'long long unsigned int' CPU: 0 PID: 8656 Comm: kworker/0:4 Not tainted 5.10.0-rc6-next-20201207-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:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395 parse_audio_format_i_type sound/usb/format.c:44 [inline] parse_audio_format_i.cold+0xba/0x3e2 sound/usb/format.c:653 snd_usb_parse_audio_format+0x89/0x290 sound/usb/format.c:753 snd_usb_get_audioformat_uac12 sound/usb/stream.c:841 [inline] __snd_usb_parse_audio_interface+0xce4/0x3cf0 sound/usb/stream.c:1170 snd_usb_parse_audio_interface+0x79/0x130 sound/usb/stream.c:1240 snd_usb_create_stream.isra.0+0x23a/0x530 sound/usb/card.c:206 snd_usb_create_streams sound/usb/card.c:278 [inline] usb_audio_probe+0x93c/0x2ab0 sound/usb/card.c:802 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396 really_probe+0x2b1/0xe40 drivers/base/dd.c:554 driver_probe_device+0x285/0x3f0 drivers/base/dd.c:738 __device_attach_driver+0x216/0x2d0 drivers/base/dd.c:844 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4c0 drivers/base/dd.c:912 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbb2/0x1ce0 drivers/base/core.c:2934 usb_set_configuration+0x113c/0x1910 drivers/usb/core/message.c:2167 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293 really_probe+0x2b1/0xe40 drivers/base/dd.c:554 driver_probe_device+0x285/0x3f0 drivers/base/dd.c:738 __device_attach_driver+0x216/0x2d0 drivers/base/dd.c:844 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4c0 drivers/base/dd.c:912 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbb2/0x1ce0 drivers/base/core.c:2934 usb_new_device.cold+0x725/0x1057 drivers/usb/core/hub.c:2555 hub_port_connect drivers/usb/core/hub.c:5223 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x2348/0x42d0 drivers/usb/core/hub.c:5591 process_one_work+0x98d/0x1630 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 ================================================================================

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