zebra: Fix leaked sockets in rtadv.c

Coverity Scan #709790
In zebra/rtadv.c: rtadv_make_socket leaks socket for error cases.
Added lines to close the socket for each error case or return.

Signed-off-by: Morgan Stewart <morgan@cumulusnetworks.com>
(cherry picked from commit 26b663da7ea8a3efae816d6e7fda293bdc1082f5)

1 files changed, 24 insertions, 6 deletions

diff --git a/zebra/rtadv.c b/zebra/rtadv.c
index f9caa85b1..89087a9ec 100644
--- a/zebra/rtadv.c
+++ b/zebra/rtadv.c
@@ -630,23 +630,41 @@ rtadv_make_socket (void)
        			 safe_strerror (errno) );
 
   if (sock < 0)
-    return -1;
+    {
+      close (sock);
+      return -1;
+    }
 
   ret = setsockopt_ipv6_pktinfo (sock, 1);
   if (ret < 0)
-    return ret;
+    {
+      close (sock);
+      return ret;
+    }
   ret = setsockopt_ipv6_multicast_loop (sock, 0);
   if (ret < 0)
-    return ret;
+    {
+      close (sock);
+      return ret;
+    }
   ret = setsockopt_ipv6_unicast_hops (sock, 255);
   if (ret < 0)
-    return ret;
+    {
+      close (sock);
+      return ret;
+    }
   ret = setsockopt_ipv6_multicast_hops (sock, 255);
   if (ret < 0)
-    return ret;
+    {
+      close (sock);
+      return ret;
+    }
   ret = setsockopt_ipv6_hoplimit (sock, 1);
   if (ret < 0)
-    return ret;
+    {
+      close (sock);
+      return ret;
+    }
 
   ICMP6_FILTER_SETBLOCKALL(&filter);
   ICMP6_FILTER_SETPASS (ND_ROUTER_SOLICIT, &filter);