linux-kernel - Re: BUG: corrupted list in nft_obj

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Message-ID: <20200116145306.GS795@breakpoint.cc>
Date:   Thu, 16 Jan 2020 15:53:06 +0100
From:   Florian Westphal <fw@...len.de>
To:     syzbot <syzbot+6ca99af7e70e298bd09d@...kaller.appspotmail.com>
Cc:     coreteam@...filter.org, davem@...emloft.net, fw@...len.de,
        kadlec@...filter.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        pablo@...filter.org, syzkaller-bugs@...glegroups.com
Subject: Re: BUG: corrupted list in nft_obj_del

syzbot <syzbot+6ca99af7e70e298bd09d@...kaller.appspotmail.com> wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    8b792f84 Merge branch 'mlxsw-Various-fixes'
> git tree:       net
> console output: https://syzkaller.appspot.com/x/log.txt?x=1766b349e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7e89bd00623fe71e
> dashboard link: https://syzkaller.appspot.com/bug?extid=6ca99af7e70e298bd09d
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=168b95e1e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10f29b3ee00000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+6ca99af7e70e298bd09d@...kaller.appspotmail.com
> 
> list_del corruption, ffff8880a46b1500->prev is LIST_POISON2

#syz fix: netfilter: nf_tables: fix flowtable list del corruption