netdev - [PATCH 13/23] netfilter: nf_ct_h323: Out Of Bound Read in Netfilter Conntrack

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Message-Id: <20171107005213.22618-14-pablo@netfilter.org>
Date:   Tue,  7 Nov 2017 01:52:03 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     netfilter-devel@...r.kernel.org
Cc:     davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 13/23] netfilter: nf_ct_h323: Out Of Bound Read in Netfilter Conntrack

From: Eric Sesterhenn <eric.sesterhenn@...-dsec.de>

Add missing counter decrement to prevent out of bounds memory read.

Signed-off-by: Eric Sesterhenn <eric.sesterhenn@...-dsec.de>
Acked-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 net/netfilter/nf_conntrack_h323_asn1.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/netfilter/nf_conntrack_h323_asn1.c b/net/netfilter/nf_conntrack_h323_asn1.c
index 7831aa1effc9..cf1bf2605c10 100644
--- a/net/netfilter/nf_conntrack_h323_asn1.c
+++ b/net/netfilter/nf_conntrack_h323_asn1.c
@@ -877,6 +877,7 @@ int DecodeQ931(unsigned char *buf, size_t sz, Q931 *q931)
 		if (sz < 1)
 			break;
 		len = *p++;
+		sz--;
 		if (sz < len)
 			break;
 		p += len;
-- 
2.11.0