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

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Date:   Thu, 28 Apr 2022 09:23:40 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Liam Howlett <liam.howlett@...cle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Christian Brauner <brauner@...nel.org>,
        syzbot <syzbot+7170d66493145b71afd4@...kaller.appspotmail.com>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>
Subject: Re: [syzbot] KASAN: use-after-free Read in mas_next_nentry

On Wed, Apr 27, 2022 at 05:22:31PM +0200, 'Dmitry Vyukov' via syzkaller-bugs wrote:
> On Wed, 27 Apr 2022 at 17:17, Liam Howlett <liam.howlett@...cle.com> wrote:
> >
> > * Matthew Wilcox <willy@...radead.org> [220427 10:58]:
> > > On Wed, Apr 27, 2022 at 02:55:58PM +0200, Christian Brauner wrote:
> > > > [+Cc Willy]
> > >
> > > I read fsdevel.  Not sure Liam does though.
> >
> > I do not.  Thank you for sending it along.
> >
> > Here is a patch that should fix the issue.  I will ask AKPM to include
> > it for tomorrow.
> 
> Please add the reported tag:
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+7170d66493145b71afd4@...kaller.appspotmail.com
> 

And a Fixes tag as well.

regards,
dan carpenter