gprs_ns2_frgre: check iph/ip6h before passing them to rx functions
With IPv4 and IPv6 support it's not guaranteed that iph/ip6h is valid.
Related CID#214288
Change-Id: If9015906917e3ad11d14b84c29d64f28a3158144
diff --git a/src/gb/gprs_ns2_frgre.c b/src/gb/gprs_ns2_frgre.c
index f163704..177aeb2 100644
--- a/src/gb/gprs_ns2_frgre.c
+++ b/src/gb/gprs_ns2_frgre.c
@@ -351,11 +351,17 @@
switch (osmo_ntohs(greh->ptype)) {
case GRE_PTYPE_IPv4:
/* IPv4 messages might be GRE keepalives */
- *error = handle_rx_gre_ipv4(bfd, msg, iph, greh);
+ if (iph)
+ *error = handle_rx_gre_ipv4(bfd, msg, iph, greh);
+ else
+ *error = -EIO;
goto out_err;
break;
case GRE_PTYPE_IPv6:
- *error = handle_rx_gre_ipv6(bfd, msg, ip6h, greh);
+ if (ip6h)
+ *error = handle_rx_gre_ipv6(bfd, msg, ip6h, greh);
+ else
+ *error = -EIO;
goto out_err;
break;
case GRE_PTYPE_FR: