From: Toby DiPasquale <toby@cbcg.net>
Date: Mon, 11 Jul 2016 10:32:45 +0000 (+0100)
Subject: netfilter: nf_conntrack_h323: fix off-by-one in DecodeQ931
X-Git-Tag: v4.8-rc1~140^2~45^2~13
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c2b9b4fee8ab86f2bb657e5ac48d803879e92765;p=karo-tx-linux.git

netfilter: nf_conntrack_h323: fix off-by-one in DecodeQ931

This patch corrects an off-by-one error in the DecodeQ931 function in
the nf_conntrack_h323 module. This error could result in reading off
the end of a Q.931 frame.

Signed-off-by: Toby DiPasquale <toby@cbcg.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---

diff --git a/net/netfilter/nf_conntrack_h323_asn1.c b/net/netfilter/nf_conntrack_h323_asn1.c
index bcd5ed6b7130..89b2e46925c4 100644
--- a/net/netfilter/nf_conntrack_h323_asn1.c
+++ b/net/netfilter/nf_conntrack_h323_asn1.c
@@ -846,9 +846,10 @@ int DecodeQ931(unsigned char *buf, size_t sz, Q931 *q931)
 	sz -= len;
 
 	/* Message Type */
-	if (sz < 1)
+	if (sz < 2)
 		return H323_ERROR_BOUND;
 	q931->MessageType = *p++;
+	sz--;
 	PRINT("MessageType = %02X\n", q931->MessageType);
 	if (*p & 0x80) {
 		p++;