ipvs: uninitialized data with IP_VS_IPV6

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@oracle.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
(cherry picked from commit 0ce625baeec39e813bef9b073f0214b513b2ef2d)
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/net/netfilter/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c
index 33e2c799cba7427b16784d0f1ce324aa3fadd11c..0e399c0e9886775ba901fad80fc0b4aa79eaf4d1 100644 (file)
--- 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;