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[patch v2] ipvs: uninitialized data with IP_VS_IPV6

To: Wensong Zhang <wensong@xxxxxxxxxxxx>
Subject: [patch v2] ipvs: uninitialized data with IP_VS_IPV6
Cc: Simon Horman <horms@xxxxxxxxxxxx>, Julian Anastasov <ja@xxxxxx>, Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>, Patrick McHardy <kaber@xxxxxxxxx>, Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, netdev@xxxxxxxxxxxxxxx, lvs-devel@xxxxxxxxxxxxxxx, netfilter-devel@xxxxxxxxxxxxxxx, coreteam@xxxxxxxxxxxxx, kernel-janitors@xxxxxxxxxxxxxxx
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Sat, 6 Dec 2014 16:49:24 +0300
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@xxxxxxxxxx>
---
v2: fix app_tcp_pkt_in() as well.  This is an old bug.

diff --git a/net/netfilter/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c
index 1d5341f..5d3daae 100644
--- a/net/netfilter/ipvs/ip_vs_ftp.c
+++ b/net/netfilter/ipvs/ip_vs_ftp.c
@@ -183,6 +183,8 @@ static int ip_vs_ftp_out(struct ip_vs_app *app, struct 
ip_vs_conn *cp,
        struct nf_conn *ct;
        struct net *net;
 
+       *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
@@ -191,8 +193,6 @@ 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;
@@ -322,6 +322,9 @@ static int ip_vs_ftp_in(struct ip_vs_app *app, struct 
ip_vs_conn *cp,
        struct ip_vs_conn *n_cp;
        struct net *net;
 
+       /* 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
@@ -330,9 +333,6 @@ 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;
--
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