linux-kernel - [PATCH] tcp: no md5sig option size check bug

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Message-ID: <AANLkTimHMAwi158ycRh_nRYPYUTSkww-psdFai-LsTsb@mail.gmail.com>
Date:	Sat, 7 Aug 2010 23:17:52 +0400
From:	Dmitry Popov <dp@...hloadlab.com>
To:	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Patrick McHardy <kaber@...sh.net>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Cc:	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	Gilad Ben-Yossef <gilad@...efidence.com>,
	Yony Amit <yony@...sleep.com>,
	Ori Finkelman <ori@...sleep.com>,
	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] tcp: no md5sig option size check bug

From: Dmitry Popov <dp@...hloadlab.com>

tcp_parse_md5sig_option doesn't check md5sig option (TCPOPT_MD5SIG)
length, but tcp_v[46]_inbound_md5_hash assume that it's at least 16
bytes long.

Signed-off-by: Dmitry Popov <dp@...hloadlab.com>
---
 net/ipv4/tcp_input.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 3c426cb..e663b78 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3930,7 +3930,7 @@ u8 *tcp_parse_md5sig_option(struct tcphdr *th)
 			if (opsize < 2 || opsize > length)
 				return NULL;
 			if (opcode == TCPOPT_MD5SIG)
-				return ptr;
+				return opsize == TCPOLEN_MD5SIG ? ptr : NULL;
 		}
 		ptr += opsize - 2;
 		length -= opsize;
--
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