linux-kernel - Re: [syzbot] KASAN: use-after-free Read in r871xu_dev

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Date:   Wed, 21 Jul 2021 13:01:43 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     syzbot <syzbot+5872a520e0ce0a7c7230@...kaller.appspotmail.com>
Cc:     Larry.Finger@...inger.net, florian.c.schilhabel@...glemail.com,
        gregkh@...uxfoundation.org, hridayhegde1999@...il.com,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev,
        rkovhaev@...il.com, straube.linux@...il.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in r871xu_dev_remove

On Mon, 12 Jul 2021 20:14:24 -0700
syzbot <syzbot+5872a520e0ce0a7c7230@...kaller.appspotmail.com> wrote:

> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    92510a7f Add linux-next specific files for 20210709
> git tree:       linux-next
> console output:
> https://syzkaller.appspot.com/x/log.txt?x=16c50180300000 kernel
> config:  https://syzkaller.appspot.com/x/.config?x=505de2716f052686
> dashboard link:
> https://syzkaller.appspot.com/bug?extid=5872a520e0ce0a7c7230 syz
> repro:
> https://syzkaller.appspot.com/x/repro.syz?x=1639a73c300000 C
> reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15fcd5e4300000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the
> commit: Reported-by:
> syzbot+5872a520e0ce0a7c7230@...kaller.appspotmail.com
> 
> usb 1-1: USB disconnect, device number 14
> ==================================================================
> BUG: KASAN: use-after-free in __lock_acquire+0x3d86/0x54a0
> kernel/locking/lockdep.c:4885 Read of size 8 at addr ffff888038bbce28
> by task kworker/1:2/4393
> 

And let's test it with this repro as well.


#syz test
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master


With regards,
Pavel Skripkin

View attachment "2patches.patch" of type "text/x-patch" (7389 bytes)