netfilter: nf_conntrack_sip: Allow ct_sip_get_header() to be called with a null ct argument

Signed-off-by: Simon Horman <horms@verge.net.au>
Acked-by: Julian Anastasov <ja@ssi.bg>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index 53d892210a0..2fd1ea2c1bb 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -152,6 +152,9 @@ static int parse_addr(const struct nf_conn *ct, const char *cp,
         const char *end;
         int ret = 0;
 
+        if (!ct)
+                return 0;
+
         memset(addr, 0, sizeof(*addr));
         switch (nf_ct_l3num(ct)) {
         case AF_INET: