netdev - [PATCH] netfilter: h323: bug in parsing of ASN1 SEQOF field

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Message-Id: <1300794929-1541-1-git-send-email-dsterba@suse.cz>
Date:	Tue, 22 Mar 2011 12:55:29 +0100
From:	David Sterba <dsterba@...e.cz>
To:	netdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, David Sterba <dsterba@...e.cz>,
	David Miller <davem@...emloft.net>, stable@...nel.org
Subject: [PATCH] netfilter: h323: bug in parsing of ASN1 SEQOF field

Static analyzer of clang found a dead store which appears to be a bug in
reading count of items in SEQOF field, only the lower byte of word is
stored. This may lead to corrupted read and communication shutdown.

The bug has been in the module since it's first inclusion into linux
kernel.

Signed-off-by: David Sterba <dsterba@...e.cz>
CC: David Miller <davem@...emloft.net>
CC: netdev@...r.kernel.org
CC: stable@...nel.org
---
 net/netfilter/nf_conntrack_h323_asn1.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/netfilter/nf_conntrack_h323_asn1.c b/net/netfilter/nf_conntrack_h323_asn1.c
index 8678823..bcd5ed6 100644
--- a/net/netfilter/nf_conntrack_h323_asn1.c
+++ b/net/netfilter/nf_conntrack_h323_asn1.c
@@ -631,7 +631,7 @@ static int decode_seqof(bitstr_t *bs, const struct field_t *f,
 		CHECK_BOUND(bs, 2);
 		count = *bs->cur++;
 		count <<= 8;
-		count = *bs->cur++;
+		count += *bs->cur++;
 		break;
 	case SEMI:
 		BYTE_ALIGN(bs);
-- 
1.7.4.1.176.g501cc

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