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From: Hajimu UMEMOTO <ume@FreeBSD.org>
Date: Thu, 17 Dec 2015 16:09:15 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org
Subject: svn commit: r292404 - stable/9/lib/libc/net
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Author: ume
Date: Thu Dec 17 16:09:15 2015
New Revision: 292404
URL: https://svnweb.freebsd.org/changeset/base/292404

Log:
  MFC r292059:
    The calls to RES_SET_H_ERRNO() macro on error paths wind up
    dereferencing an uninitialized res.
  
  PR:		202142
  Submitted by:	Sean Boudreau

Modified:
  stable/9/lib/libc/net/getaddrinfo.c
Directory Properties:
  stable/9/lib/libc/   (props changed)

Modified: stable/9/lib/libc/net/getaddrinfo.c
==============================================================================
--- stable/9/lib/libc/net/getaddrinfo.c	Thu Dec 17 16:08:28 2015	(r292403)
+++ stable/9/lib/libc/net/getaddrinfo.c	Thu Dec 17 16:09:15 2015	(r292404)
@@ -2202,6 +2202,8 @@ _dns_getaddrinfo(void *rv, void *cb_data
 	memset(&sentinel, 0, sizeof(sentinel));
 	cur = &sentinel;
 
+	res = __res_state();
+
 	buf = malloc(sizeof(*buf));
 	if (!buf) {
 		RES_SET_H_ERRNO(res, NETDB_INTERNAL);
@@ -2248,7 +2250,6 @@ _dns_getaddrinfo(void *rv, void *cb_data
 		return NS_UNAVAIL;
 	}
 
-	res = __res_state();
 	if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) {
 		RES_SET_H_ERRNO(res, NETDB_INTERNAL);
 		free(buf);