From: Eric Dumazet <eric.dumazet@gmail.com>
To: Changli Gao <xiaosuo@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>,
Patrick McHardy <kaber@trash.net>,
Pablo Neira Ayuso <pablo@netfilter.org>,
netfilter-devel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH] net: check the length of the data before dereferencing it
Date: Mon, 02 Apr 2012 05:19:33 +0200 [thread overview]
Message-ID: <1333336773.2325.6531.camel@edumazet-glaptop> (raw)
In-Reply-To: <1333336250-4110-1-git-send-email-xiaosuo@gmail.com>
On Mon, 2012-04-02 at 11:10 +0800, Changli Gao wrote:
> We should check the length of the data before dereferencing it when parsing
> the TCP options.
>
> Signed-off-by: Changli Gao <xiaosuo@gmail.com>
> ---
> net/ipv4/tcp_input.c | 2 ++
> 1 file changed, 2 insertions(+)
> diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
> index e886e2f..5099f08 100644
> --- a/net/ipv4/tcp_input.c
> +++ b/net/ipv4/tcp_input.c
> @@ -3845,6 +3845,8 @@ void tcp_parse_options(const struct sk_buff *skb, struct tcp_options_received *o
> length--;
> continue;
> default:
> + if (length < 2)
> + return;
> opsize = *ptr++;
> if (opsize < 2) /* "silly options" */
> return;
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
next prev parent reply other threads:[~2012-04-02 3:19 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-02 3:10 [PATCH] net: check the length of the data before dereferencing it Changli Gao
2012-04-02 3:19 ` Eric Dumazet [this message]
2012-04-02 3:29 ` David Miller
2012-04-02 3:45 ` Changli Gao
2012-04-02 3:53 ` Eric Dumazet
2012-04-02 3:57 ` David Miller
2012-04-02 3:59 ` Eric Dumazet
2012-04-02 4:47 ` Changli Gao
2012-04-02 4:54 ` Eric Dumazet
2012-04-02 6:27 ` Changli Gao
2012-04-02 6:43 ` Eric Dumazet
2012-04-02 3:45 ` Eric Dumazet
2012-04-02 3:55 ` David Miller
2012-04-02 3:58 ` Eric Dumazet
2012-04-02 4:14 ` David Miller
2012-04-02 3:19 ` David Miller
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