ctdb-common: Ensure unused bytes in union are initialised

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>

diff --git a/ctdb/common/ctdb_util.c b/ctdb/common/ctdb_util.c
index 901e5e2a6301384af83fefd0f6075d59953d4173..82526b58a1987f75ae35ea0429aa29ab2b8adc9c 100644 (file)
--- a/ctdb/common/ctdb_util.c
+++ b/ctdb/common/ctdb_util.c
@@ -373,19 +373,45 @@ struct ctdb_rec_data_old *ctdb_marshall_loop_next(
 */
 void ctdb_canonicalize_ip(const ctdb_sock_addr *ip, ctdb_sock_addr *cip)
 {
-       char prefix[12] = { 0,0,0,0,0,0,0,0,0,0,0xff,0xff };
+       ZERO_STRUCTP(cip);
 
-       memcpy(cip, ip, sizeof (*cip));
-
-       if ( (ip->sa.sa_family == AF_INET6)
-       && !memcmp(&ip->ip6.sin6_addr, prefix, 12)) {
-               memset(cip, 0, sizeof(*cip));
+       if (ip->sa.sa_family == AF_INET6) {
+               const char prefix[12] = { 0,0,0,0,0,0,0,0,0,0,0xff,0xff };
+               if (memcmp(&ip->ip6.sin6_addr, prefix, sizeof(prefix)) == 0) {
+                       /* Copy IPv4-mapped IPv6 addresses as IPv4 */
+                       cip->ip.sin_family = AF_INET;
+#ifdef HAVE_SOCK_SIN_LEN
+                       cip->ip.sin_len = sizeof(ctdb_sock_addr);
+#endif
+                       cip->ip.sin_port   = ip->ip6.sin6_port;
+                       memcpy(&cip->ip.sin_addr,
+                              &ip->ip6.sin6_addr.s6_addr[12],
+                              sizeof(cip->ip.sin_addr));
+               } else {
+                       cip->ip6.sin6_family = AF_INET6;
 #ifdef HAVE_SOCK_SIN_LEN
-               cip->ip.sin_len = sizeof(*cip);
+                       cip->ip6.sin_len = sizeof(ctdb_sock_addr);
 #endif
+                       cip->ip6.sin6_port   = ip->ip6.sin6_port;
+                       memcpy(&cip->ip6.sin6_addr,
+                              &ip->ip6.sin6_addr,
+                              sizeof(cip->ip6.sin6_addr));
+               }
+
+               return;
+       }
+
+       if (ip->sa.sa_family == AF_INET) {
                cip->ip.sin_family = AF_INET;
-               cip->ip.sin_port   = ip->ip6.sin6_port;
-               memcpy(&cip->ip.sin_addr, &ip->ip6.sin6_addr.s6_addr[12], 4);
+#ifdef HAVE_SOCK_SIN_LEN
+               cip->ip.sin_len = sizeof(ctdb_sock_addr);
+#endif
+               cip->ip.sin_port = ip->ip.sin_port;
+               memcpy(&cip->ip.sin_addr,
+                      &ip->ip.sin_addr,
+                      sizeof(ip->ip.sin_addr));
+
+               return;
        }
 }