Hello,

syzbot found the following crash on:

HEAD commit: 69bbe8c7 usb-fuzzer: main usb gadget fuzzer driver git tree: https://github.com/google/kasan.git usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=118b0aa2a00000 kernel config: https://syzkaller.appspot.com/x/.config?x=c309d28e15db39c5 dashboard link: https://syzkaller.appspot.com/bug?extid=5255458d5e0a2b10bbb9 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11f4064ca00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14d51982a00000

IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+5255458d5e0a2b10bbb9@syzkaller.appspotmail.com

snd_usb_toneport 1-1:0.0: read request failed (error -110) snd_usb_toneport 1-1:0.0: read request failed (error -110) snd_usb_toneport 1-1:0.0: write request failed (error -110) usb 1-1: send failed (error -110) usb 1-1: send failed (error -110) snd_usb_toneport 1-1:0.0: Line 6 POD Studio UX2 now attached ================================================================== BUG: KASAN: null-ptr-deref in memset include/linux/string.h:344 [inline] BUG: KASAN: null-ptr-deref in submit_audio_out_urb+0x919/0x1780 sound/usb/line6/playback.c:246 Write of size 20 at addr 0000000000000010 by task kworker/1:2/2466

CPU: 1 PID: 2466 Comm: kworker/1:2 Not tainted 5.2.0-rc1+ #9 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events toneport_start_pcm Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xca/0x13e lib/dump_stack.c:113 __kasan_report.cold+0x5/0x32 mm/kasan/report.c:321 kasan_report+0xe/0x20 mm/kasan/common.c:614 memset+0x20/0x40 mm/kasan/common.c:107 memset include/linux/string.h:344 [inline] submit_audio_out_urb+0x919/0x1780 sound/usb/line6/playback.c:246 line6_submit_audio_out_all_urbs+0xc9/0x120 sound/usb/line6/playback.c:295 line6_stream_start+0x156/0x1f0 sound/usb/line6/pcm.c:199 line6_pcm_acquire+0x134/0x210 sound/usb/line6/pcm.c:322 process_one_work+0x90a/0x1580 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x30e/0x420 kernel/kthread.c:254 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 2466 Comm: kworker/1:2 Tainted: G B 5.2.0-rc1+ #9 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events toneport_start_pcm Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xca/0x13e lib/dump_stack.c:113 panic+0x292/0x6df kernel/panic.c:218 end_report+0x43/0x49 mm/kasan/report.c:95 __kasan_report.cold+0xd/0x32 mm/kasan/report.c:324 kasan_report+0xe/0x20 mm/kasan/common.c:614 memset+0x20/0x40 mm/kasan/common.c:107 memset include/linux/string.h:344 [inline] submit_audio_out_urb+0x919/0x1780 sound/usb/line6/playback.c:246 line6_submit_audio_out_all_urbs+0xc9/0x120 sound/usb/line6/playback.c:295 line6_stream_start+0x156/0x1f0 sound/usb/line6/pcm.c:199 line6_pcm_acquire+0x134/0x210 sound/usb/line6/pcm.c:322 process_one_work+0x90a/0x1580 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x30e/0x420 kernel/kthread.c:254 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..

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