netdev - Re: memory leak in nf_tables_parse_netdev

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Message-ID: <20200609223201.GA29165@salvia>
Date:   Wed, 10 Jun 2020 00:32:01 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     syzbot <syzbot+eb9d5924c51d6d59e094@...kaller.appspotmail.com>
Cc:     coreteam@...filter.org, davem@...emloft.net, fw@...len.de,
        kadlec@...filter.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: memory leak in nf_tables_parse_netdev_hooks (3)

On Tue, Jun 09, 2020 at 02:58:12PM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    7ae77150 Merge tag 'powerpc-5.8-1' of git://git.kernel.org..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1741f5f2100000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=9a1aa05456dfd557
> dashboard link: https://syzkaller.appspot.com/bug?extid=eb9d5924c51d6d59e094
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=126f5446100000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=177f16fe100000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+eb9d5924c51d6d59e094@...kaller.appspotmail.com

Attaching a quick patch, I will have a closer look later.

View attachment "x.patch" of type "text/x-diff" (2070 bytes)