* ext/socket/ancdata.c (bsock_sendmsg_internal): controls_num should

not be negative.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40626 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu May  9 22:00:35 2013  Tanaka Akira  <akr@fsij.org>
+
+	* ext/socket/ancdata.c (bsock_sendmsg_internal): controls_num should
+	  not be negative.
+
 Thu May  9 21:09:57 2013  Tanaka Akira  <akr@fsij.org>
 
 	* file.c, ext/etc/etc.c, ext/socket/unixsocket.c,

ext/socket/ancdata.c

@@ -1153,7 +1153,7 @@ bsock_sendmsg_internal(int argc, VALUE *argv, VALUE sock, int nonblock)
     data = argv[0];
     if (1 < argc) vflags = argv[1];
     if (2 < argc) dest_sockaddr = argv[2];
-    controls_num = argc - 3;
+    controls_num = 3 < argc ? argc - 3 : 0;
 #if defined(HAVE_STRUCT_MSGHDR_MSG_CONTROL)
     if (3 < argc) { controls_ptr = &argv[3]; }
 #endif