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From: David Chisnall <theraven@FreeBSD.org>
Date: Wed, 2 Apr 2014 11:10:46 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r264038 - head/lib/libc/locale
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Author: theraven
Date: Wed Apr  2 11:10:46 2014
New Revision: 264038
URL: http://svnweb.freebsd.org/changeset/base/264038

Log:
  Fix an issue where the locale and rune locale could become out of sync,
  causing mb* functions (and similar) to be called with the wrong data
  (possibly a null pointer, causing a crash).
  
  PR:		standards/188036
  MFC after:	1 week

Modified:
  head/lib/libc/locale/setrunelocale.c
  head/lib/libc/locale/xlocale.c

Modified: head/lib/libc/locale/setrunelocale.c
==============================================================================
--- head/lib/libc/locale/setrunelocale.c	Wed Apr  2 10:57:11 2014	(r264037)
+++ head/lib/libc/locale/setrunelocale.c	Wed Apr  2 11:10:46 2014	(r264038)
@@ -202,6 +202,8 @@ __set_thread_rune_locale(locale_t loc)
 
 	if (loc == NULL) {
 		_ThreadRuneLocale = &_DefaultRuneLocale;
+	} else if (loc == LC_GLOBAL_LOCALE) {
+		_ThreadRuneLocale = 0;
 	} else {
 		_ThreadRuneLocale = XLOCALE_CTYPE(loc)->runes;
 	}

Modified: head/lib/libc/locale/xlocale.c
==============================================================================
--- head/lib/libc/locale/xlocale.c	Wed Apr  2 10:57:11 2014	(r264037)
+++ head/lib/libc/locale/xlocale.c	Wed Apr  2 11:10:46 2014	(r264038)
@@ -154,23 +154,24 @@ __get_locale(void)
 static void
 set_thread_locale(locale_t loc)
 {
+	locale_t l = (loc == LC_GLOBAL_LOCALE) ? 0 : loc;
 
 	_once(&once_control, init_key);
 	
-	if (NULL != loc) {
-		xlocale_retain((struct xlocale_refcounted*)loc);
+	if (NULL != l) {
+		xlocale_retain((struct xlocale_refcounted*)l);
 	}
 	locale_t old = pthread_getspecific(locale_info_key);
-	if ((NULL != old) && (loc != old)) {
+	if ((NULL != old) && (l != old)) {
 		xlocale_release((struct xlocale_refcounted*)old);
 	}
 	if (fake_tls) {
-		thread_local_locale = loc;
+		thread_local_locale = l;
 	} else {
-		pthread_setspecific(locale_info_key, loc);
+		pthread_setspecific(locale_info_key, l);
 	}
 #ifndef __NO_TLS
-	__thread_locale = loc;
+	__thread_locale = l;
 	__set_thread_rune_locale(loc);
 #endif
 }
@@ -361,9 +362,6 @@ locale_t uselocale(locale_t loc)
 {
 	locale_t old = get_thread_locale();
 	if (NULL != loc) {
-		if (LC_GLOBAL_LOCALE == loc) {
-			loc = NULL;
-		}
 		set_thread_locale(loc);
 	}
 	return (old ? old : LC_GLOBAL_LOCALE);