* ext/socket/ipsocket.c (ip_s_getaddress): Don't access freed memory.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45045 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Wed Feb 19 17:47:01 2014  Tanaka Akira  <akr@fsij.org>
+
+	* ext/socket/ipsocket.c (ip_s_getaddress): Don't access freed memory.
+
 Wed Feb 19 11:39:41 2014  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* configure.in: it must see rb_cv_broken_memmem not rb_cv_func_memmem.

ext/socket/ipsocket.c

@@ -305,12 +305,13 @@ ip_s_getaddress(VALUE obj, VALUE host)
 {
     union_sockaddr addr;
     struct addrinfo *res = rsock_addrinfo(host, Qnil, SOCK_STREAM, 0);
+    socklen_t len = res->ai_addrlen;
 
     /* just take the first one */
-    memcpy(&addr, res->ai_addr, res->ai_addrlen);
+    memcpy(&addr, res->ai_addr, len);
     freeaddrinfo(res);
 
-    return rsock_make_ipaddr(&addr.addr, res->ai_addrlen);
+    return rsock_make_ipaddr(&addr.addr, len);
 }
 
 void