[NETFILTER]: nf_conntrack_sip: check sname != NULL before calling strncmp

The check got lost during the conversion to nf_conntrack.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index 1276a442f10c..5cc9636e46e9 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -330,7 +330,8 @@ int ct_sip_get_info(struct nf_conn *ct,
 
         while (dptr <= limit) {
                 if ((strncmp(dptr, hnfo->lname, hnfo->lnlen) != 0) &&
-                    (strncmp(dptr, hnfo->sname, hnfo->snlen) != 0)) {
+                    (hnfo->sname == NULL ||
+                     strncmp(dptr, hnfo->sname, hnfo->snlen) != 0)) {
                         dptr++;
                         continue;
                 }