[src/trunk]: src/lib/libc/string Protect against malloc failure corrupting er...

[kre <kre%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/8a22093bb043
branches:  trunk
changeset: 746227:8a22093bb043
user:      kre <kre%NetBSD.org@localhost>
date:      Wed Mar 25 16:10:17 2020 +0000

description:
Protect against malloc failure corrupting errno, which is not
permitted of these functions.

diffstat:

 lib/libc/string/strerror.c |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (28 lines):

diff -r 57ff84f0b63d -r 8a22093bb043 lib/libc/string/strerror.c
--- a/lib/libc/string/strerror.c        Wed Mar 25 13:07:04 2020 +0000
+++ b/lib/libc/string/strerror.c        Wed Mar 25 16:10:17 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: strerror.c,v 1.17 2015/01/20 18:31:25 christos Exp $   */
+/*     $NetBSD: strerror.c,v 1.18 2020/03/25 16:10:17 kre Exp $        */
 
 /*
  * Copyright (c) 1988 Regents of the University of California.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: strerror.c,v 1.17 2015/01/20 18:31:25 christos Exp $");
+__RCSID("$NetBSD: strerror.c,v 1.18 2020/03/25 16:10:17 kre Exp $");
 
 #define __SETLOCALE_SOURCE__
 
@@ -78,7 +78,9 @@
        thr_once(&strerror_once, strerror_setup);
        buf = thr_getspecific(strerror_key);
        if (buf == NULL) {
+               error = errno;
                buf = malloc(NL_TEXTMAX);
+               errno = error;
                if (buf == NULL) {
                        static char fallback_buf[NL_TEXTMAX];
                        buf = fallback_buf;