* ext/socket/ifaddr.c (rsock_getifaddrs): fix possible memory leak.

When a system had no interface, this function used xmalloc for root
  but did not return any reference to it.  This patch fixes it by
  immediately returning an empty array if no interface is found.
  Coverity Scan found this bug.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43121 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,11 @@
+Wed Oct  2 21:38:30 2013  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* ext/socket/ifaddr.c (rsock_getifaddrs): fix possible memory leak.
+	  When a system had no interface, this function used xmalloc for root
+	  but did not return any reference to it.  This patch fixes it by
+	  immediately returning an empty array if no interface is found.
+	  Coverity Scan found this bug.
+
 Wed Oct  2 21:37:04 2013  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* random.c (make_seed_value): a local array declaration was accessed

ext/socket/ifaddr.c

@@ -105,6 +105,10 @@ rsock_getifaddrs(void)
     if (ret == -1)
         rb_sys_fail("getifaddrs");
 
+    if (!ifaddrs) {
+	return rb_ary_new();
+    }
+
     numifaddrs = 0;
     for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next)
         numifaddrs++;