fpm: guard against garbage in unused address bytes

Zero out the 12 unused bytes (for the IPv6 address) when reading in an
IPv4 address.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
(cherry picked from commit 95cf0b227980999e2af22a2c171e5237e5ffca8e)

diff --git a/fpm/fpm_pb.h b/fpm/fpm_pb.h
index 23d7e43993bea8040926fa0696f466794a33d520..8847365a3729e23ecbd1a487737bd01c64c71b39 100644 (file)
--- a/fpm/fpm_pb.h
+++ b/fpm/fpm_pb.h
@@ -111,6 +111,7 @@ static inline int fpm__nexthop__get(const Fpm__Nexthop *nh,
 
                        nexthop->vrf_id = VRF_DEFAULT;
                        nexthop->type = NEXTHOP_TYPE_IPV4;
+                       memset(&nexthop->gate, 0, sizeof(nexthop->gate));
                        nexthop->gate.ipv4 = ipv4;
                        if (ifindex) {
                                nexthop->type = NEXTHOP_TYPE_IPV4_IFINDEX;