linux-kernel - Re: WARNING in __proc

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Message-ID: <20200122081340.2bhx5jfezl55b3qb@kili.mountain>
Date:   Wed, 22 Jan 2020 11:13:40 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     syzbot <syzbot+b904ba7c947a37b4b291@...kaller.appspotmail.com>,
        dhowells@...hat.com
Cc:     linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in __proc_create (2)

On Tue, Jan 21, 2020 at 03:56:08PM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    d96d875e Merge tag 'fixes_for_v5.5-rc8' of git://git.kerne..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=13b7b80de00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=83c00afca9cf5153
> dashboard link: https://syzkaller.appspot.com/bug?extid=b904ba7c947a37b4b291
> compiler:       clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12c96185e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14f859c9e00000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+b904ba7c947a37b4b291@...kaller.appspotmail.com
> 
> ------------[ cut here ]------------
> name '��/]uwo,"� c�ac�����[� $�5x~�s�&�tw}���z �cp ('
          ^

Hi David,

We should probably ban '/' characters from the cell name in
afs_alloc_cell().

regards,
dan carpenter