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Date:   Tue, 09 Mar 2021 04:23:03 -0800
In-Reply-To: <CACT4Y+bWYQu3h8pJaX4GS1JdJpPheE416TJH4=K5zOaseAH4Fg@mail.gmail.com>
Message-ID: <000000000000ac694305bd199c9c@google.com>
Subject: Re: [syzbot] KASAN: use-after-free Read in usb_audio_disconnect
From:   syzbot <syzbot+@syzkaller.appspotmail.com>
To:     "'Dmitry Vyukov' via syzkaller-bugs" 
        <syzkaller-bugs@googlegroups.com>
Cc:     alsa-devel@alsa-project.org, kai.heng.feng@canonical.com,
        linux-kernel@vger.kernel.org, perex@perex.cz,
        syzkaller-bugs@googlegroups.com, tiwai@suse.com, tiwai@suse.de
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> On Tue, Mar 9, 2021 at 12:38 PM Takashi Iwai <tiwai@suse.de> wrote:
>>
>> On Tue, 09 Mar 2021 12:32:18 +0100,
>> syzbot wrote:
>> >
>> > Hello,
>> >
>> > syzbot found the following issue on:
>> >
>> > HEAD commit:    4641b323 Add linux-next specific files for 20210305
>> > git tree:       linux-next
>> > console output: https://syzkaller.appspot.com/x/log.txt?x=103252ead00000
>> > kernel config:  https://syzkaller.appspot.com/x/.config?x=b87b6a083d302a90
>> > dashboard link: https://syzkaller.appspot.com/bug?extid=ffad4c74b3b3ea3aa9c3
>> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1122d35cd00000
>> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17f6476cd00000
>> >
>> > The issue was bisected to:
>> >
>> > commit 9799110825dba087c2bdce886977cf84dada2005
>> > Author: Kai-Heng Feng <kai.heng.feng@canonical.com>
>> > Date:   Thu Mar 4 04:34:16 2021 +0000
>> >
>> >     ALSA: usb-audio: Disable USB autosuspend properly in setup_disable_autosuspend()
>> >
>> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=166d91ead00000
>> > final oops:     https://syzkaller.appspot.com/x/report.txt?x=156d91ead00000
>> > console output: https://syzkaller.appspot.com/x/log.txt?x=116d91ead00000
>> >
>> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> > Reported-by: syzbot+ffad4c74b3b3ea3aa9c3@syzkaller.appspotmail.com
>> > Fixes: 9799110825db ("ALSA: usb-audio: Disable USB autosuspend properly in setup_disable_autosuspend()")
>> >
>> > usb 1-1: USB disconnect, device number 2
>> > ==================================================================
>> > BUG: KASAN: use-after-free in usb_audio_disconnect+0x750/0x800 sound/usb/card.c:918
>>
>> This must be fixed by the commit that was already merged to sound.git
>> tree today:
>> c5aa956eaeb0 ("ALSA: usb-audio: fix use after free in usb_audio_disconnect")
>
>
> #syz fix: ALSA: usb-audio: fix use after free in usb_audio_disconnect

I see the command but can't find the corresponding bug.
Please resend the email to syzbot+HASH@syzkaller.appspotmail.com address
that is the sender of the bug report (also present in the Reported-by tag).

>
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