[COMMITTED 2.22] Fix resource leak in resolver (bug 19257)

[Aurelien Jarno]

From: Andreas Schwab <schwab@suse.de>

The number of currently defined nameservers is stored in ->nscount,
whereas ->_u._ext.nscount is set by __libc_res_nsend only after local
initializations.

(cherry picked from commit 5e7fdabd7df1fc6c56d104e61390bf5a6b526c38)
---
 ChangeLog         | 6 ++++++
 resolv/res_init.c | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index b224f46..ba4a3f2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2016-03-15  Andreas Schwab  <schwab@suse.de>
+
+	[BZ #19257]
+	* resolv/res_init.c (__res_iclose): Use statp->nscount instead of
+	statp->_u._ext.nscount as loop count.
+
 2016-02-17  Andrew Senkevich  <andrew.senkevich@intel.com>
 	    H.J. Lu  <hongjiu.lu@intel.com>
 
diff --git a/resolv/res_init.c b/resolv/res_init.c
index 66561ff..77873c1 100644
--- a/resolv/res_init.c
+++ b/resolv/res_init.c
@@ -593,7 +593,7 @@ __res_iclose(res_state statp, bool free_addr) {
 		statp->_vcsock = -1;
 		statp->_flags &= ~(RES_F_VC | RES_F_CONN);
 	}
-	for (ns = 0; ns < statp->_u._ext.nscount; ns++)
+	for (ns = 0; ns < statp->nscount; ns++)
 		if (statp->_u._ext.nsaddrs[ns]) {
 			if (statp->_u._ext.nssocks[ns] != -1) {
 				close_not_cancel_no_status(statp->_u._ext.nssocks[ns]);
-- 
2.7.0