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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Thu, 26 Feb 2015 09:42:04 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r279318 - head/lib/libstdthreads
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Author: kib
Date: Thu Feb 26 09:42:03 2015
New Revision: 279318
URL: https://svnweb.freebsd.org/changeset/base/279318

Log:
  Check that the pointer to the thread return value is not NULL before
  dereferencing. NULL is allowed by C11 and must be handled.
  
  Reported and tested by:	Vineela <vineela_17@yahoo.com>
  PR:	198038
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week

Modified:
  head/lib/libstdthreads/thrd.c

Modified: head/lib/libstdthreads/thrd.c
==============================================================================
--- head/lib/libstdthreads/thrd.c	Thu Feb 26 09:31:25 2015	(r279317)
+++ head/lib/libstdthreads/thrd.c	Thu Feb 26 09:42:03 2015	(r279318)
@@ -108,7 +108,8 @@ thrd_join(thrd_t thr, int *res)
 
 	if (pthread_join(thr, &value_ptr) != 0)
 		return (thrd_error);
-	*res = (intptr_t)value_ptr;
+	if (res != NULL)
+		*res = (intptr_t)value_ptr;
 	return (thrd_success);
 }