linux-kernel - [ 41/48] ipvs: uninitialized data with IP_VS

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Date:	Fri, 15 May 2015 10:06:11 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	Julian Anastasov <ja@....bg>,
	Simon Horman <horms@...ge.net.au>,
	Ben Hutchings <ben@...adent.org.uk>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Willy Tarreau <w@....eu>
Subject: [ 41/48] ipvs: uninitialized data with IP_VS_IPV6

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 3b05ac3824ed9648c0d9c02d51d9b54e4e7e874f upstream.

The app_tcp_pkt_out() function expects "*diff" to be set and ends up
using uninitialized data if CONFIG_IP_VS_IPV6 is turned on.

The same issue is there in app_tcp_pkt_in().  Thanks to Julian Anastasov
for noticing that.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Julian Anastasov <ja@....bg>
Signed-off-by: Simon Horman <horms@...ge.net.au>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Cc: Pablo Neira Ayuso <pablo@...filter.org>
(cherry picked from commit 0ce625baeec39e813bef9b073f0214b513b2ef2d)
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/netfilter/ipvs/ip_vs_ftp.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c
index 33e2c79..0e399c0 100644
--- a/net/netfilter/ipvs/ip_vs_ftp.c
+++ b/net/netfilter/ipvs/ip_vs_ftp.c
@@ -150,6 +150,8 @@ static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp,
 	unsigned buf_len;
 	int ret;
 
+	*diff = 0;
+
 #ifdef CONFIG_IP_VS_IPV6
 	/* This application helper doesn't work with IPv6 yet,
 	 * so turn this into a no-op for IPv6 packets
@@ -158,8 +160,6 @@ static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp,
 		return 1;
 #endif
 
-	*diff = 0;
-
 	/* Only useful for established sessions */
 	if (cp->state != IP_VS_TCP_S_ESTABLISHED)
 		return 1;
@@ -257,6 +257,9 @@ static int ip_vs_ftp_in(struct ip_vs_app *app, struct ip_vs_conn *cp,
 	__be16 port;
 	struct ip_vs_conn *n_cp;
 
+	/* no diff required for incoming packets */
+	*diff = 0;
+
 #ifdef CONFIG_IP_VS_IPV6
 	/* This application helper doesn't work with IPv6 yet,
 	 * so turn this into a no-op for IPv6 packets
@@ -265,9 +268,6 @@ static int ip_vs_ftp_in(struct ip_vs_app *app, struct ip_vs_conn *cp,
 		return 1;
 #endif
 
-	/* no diff required for incoming packets */
-	*diff = 0;
-
 	/* Only useful for established sessions */
 	if (cp->state != IP_VS_TCP_S_ESTABLISHED)
 		return 1;
-- 
1.7.12.2.21.g234cd45.dirty



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