linux-kernel - Re: [syzbot] WARNING in batadv_nc_mesh

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Date:   Fri, 22 Oct 2021 23:58:15 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     syzbot <syzbot+28b0702ada0bf7381f58@...kaller.appspotmail.com>,
        a@...table.cc, b.a.t.m.a.n@...ts.open-mesh.org,
        davem@...emloft.net, kuba@...nel.org, linux-kernel@...r.kernel.org,
        mareklindner@...mailbox.ch, netdev@...r.kernel.org,
        sven@...fation.org, sw@...onwunderlich.de,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in batadv_nc_mesh_free

On 10/22/21 23:57, Pavel Skripkin wrote:
> On 10/22/21 23:20, syzbot wrote:
>> Hello,
>> 
>> syzbot has tested the proposed patch but the reproducer is still triggering an issue:
>> general protection fault in batadv_nc_purge_paths
> 
> 
> Oh, ok. Next clean up call in batadv_nc_mesh_free() caused GPF, since
> fields are not initialized. Let's try to clean up one by one and do not
> break dependencies.
> 
> Quite ugly one, but idea is correct, I guess
> 
> Also, make each *_init() call clean up all allocated stuff to not call
> corresponding *_free() on error handling path, since it introduces
> problems, as syzbot reported
> 
> 
> 
> 

Whooops.... Forgot to ask syzbot to test the patch

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




With regards,
Pavel Skripkin
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