[2.27 COMMITTED] Fix crash in resolver on memory allocation failure (bug 23005)

[Dmitry V. Levin]

From: Andreas Schwab <schwab@suse.de>

(cherry picked from commit f178e59fa5eefbbd37fde040ae8334aa5c857ee1)
---
 ChangeLog         | 6 ++++++
 resolv/res_send.c | 5 +++++
 2 files changed, 11 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index f9d7618..89ecd49 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2018-03-27  Andreas Schwab  <schwab@suse.de>
+
+	[BZ #23005]
+	* resolv/res_send.c (__res_context_send): Return ENOMEM if
+	allocation of private copy of nsaddr_list fails.
+
 2018-03-20  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #17343]
diff --git a/resolv/res_send.c b/resolv/res_send.c
index dde0425..7debf14 100644
--- a/resolv/res_send.c
+++ b/resolv/res_send.c
@@ -471,6 +471,11 @@ __res_context_send (struct resolv_context *ctx,
 					'\0',
 					sizeof (struct sockaddr_in6)
 					- sizeof (struct sockaddr_in));
+			else
+			  {
+			    __set_errno (ENOMEM);
+			    return -1;
+			  }
 		}
 		EXT(statp).nscount = statp->nscount;
 	}
-- 
ldv