linux-kernel - Re: general protection fault in snd_usb_pipe_sanity

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Date:   Tue, 30 Jul 2019 09:43:02 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Hillf Danton <hdanton@...a.com>
Cc:     syzbot <syzbot+d59c4387bfb6eced94e2@...kaller.appspotmail.com>,
        <alsa-devel@...a-project.org>, <andreyknvl@...gle.com>,
        <syzkaller-bugs@...glegroups.com>, <tglx@...utronix.de>,
        <gregkh@...uxfoundation.org>, <allison@...utok.net>,
        <perex@...ex.cz>, <rfontana@...hat.com>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: general protection fault in snd_usb_pipe_sanity_check

On Mon, 29 Jul 2019 18:38:06 +0200,
syzbot wrote:
> 
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    7f7867ff 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=12befdc8600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=792eb47789f57810
> dashboard link: https://syzkaller.appspot.com/bug?extid=d59c4387bfb6eced94e2
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16efc49fa00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13245854600000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+d59c4387bfb6eced94e2@...kaller.appspotmail.com
> 
> usb 1-1: New USB device found, idVendor=07fd, idProduct=0004,
> bcdDevice=d5.ac
> 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
> usb 1-1: Waiting for MOTU Microbook II to boot up...
> kasan: CONFIG_KASAN_INLINE enabled
> kasan: GPF could be caused by NULL-ptr deref or user memory access
> general protection fault: 0000 [#1] SMP KASAN
> CPU: 1 PID: 21 Comm: kworker/1:1 Not tainted 5.3.0-rc2+ #23
> Hardware name: Google Google Compute Engine/Google Compute Engine,
> BIOS  Google 01/01/2011
> Workqueue: usb_hub_wq hub_event
> RIP: 0010:snd_usb_pipe_sanity_check+0x80/0x130 sound/usb/helper.c:75
> Code: 48 c1 ea 03 80 3c 02 00 0f 85 b3 00 00 00 48 8b 6d 00 c1 eb 1e
> 48 b8  00 00 00 00 00 fc ff df 48 8d 7d 03 48 89 fa 48 c1 ea 03 <0f>
> b6 04 02 48  89 fa 83 e2 07 38 d0 7f 04 84 c0 75 7b 48 b8 00 00
> RSP: 0018:ffff8881da2f7010 EFLAGS: 00010246
> RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff8484d252
> RDX: 0000000000000000 RSI: ffffffff8484d26c RDI: 0000000000000003
> RBP: 0000000000000000 R08: ffff8881da22e000 R09: ffffed103b665d58
> R10: ffffed103b665d57 R11: ffff8881db32eabf R12: 0000000000000000
> R13: ffff8881d400ba80 R14: 1ffff1103b45ee06 R15: ffff8881c79244a0
> FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f31b2a87000 CR3: 00000001d3fd4000 CR4: 00000000001406e0
> Call Trace:
>  snd_usb_motu_microbookii_communicate.constprop.0+0xa0/0x2fb
> sound/usb/quirks.c:1007
>  snd_usb_motu_microbookii_boot_quirk sound/usb/quirks.c:1051 [inline]
>  snd_usb_apply_boot_quirk.cold+0x163/0x370 sound/usb/quirks.c:1280
>  usb_audio_probe+0x2ec/0x2010 sound/usb/card.c:576
>  usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
>  really_probe+0x281/0x650 drivers/base/dd.c:548
>  driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
(snip)

So finally we hit this known issue.  Hillf, please mark this one to
your fix patch once when ready.


Thanks!

Takashi