netdev - Re: [PATCH nf] netfilter: ipset: avoid null deref when IPSET_ATTR

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Message-ID: <20200108223223.bvyvyy6il664whtb@salvia>
Date:   Wed, 8 Jan 2020 23:32:23 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Florian Westphal <fw@...len.de>
Cc:     netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        syzbot+34bd2369d38707f3f4a7@...kaller.appspotmail.com
Subject: Re: [PATCH nf] netfilter: ipset: avoid null deref when
 IPSET_ATTR_LINENO is present

On Wed, Jan 08, 2020 at 10:59:38AM +0100, Florian Westphal wrote:
> The set uadt functions assume lineno is never NULL, but it is in
> case of ip_set_utest().
> 
> syzkaller managed to generate a netlink message that calls this with
> LINENO attr present:
> 
> general protection fault: 0000 [#1] PREEMPT SMP KASAN
> RIP: 0010:hash_mac4_uadt+0x1bc/0x470 net/netfilter/ipset/ip_set_hash_mac.c:104
> Call Trace:
>  ip_set_utest+0x55b/0x890 net/netfilter/ipset/ip_set_core.c:1867
>  nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229
>  netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
>  nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563
> 
> pass a dummy lineno storage, its easier than patching all set
> implementations.
> 
> This seems to be a day-0 bug.

Also applied, thanks.