From 1e735a3234a159e7d6dbc69d7512969afcdf9702 Mon Sep 17 00:00:00 2001
From: jan <jan@openbsd.org>
Date: Mon, 27 Mar 2023 09:15:45 +0000
Subject: [PATCH] Avoid errno is EINVAL after OpenSSL initialization

ok tb@
---
 lib/libcrypto/err/err.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/libcrypto/err/err.c b/lib/libcrypto/err/err.c
index 403fcd46077..2eca16d77c6 100644
--- a/lib/libcrypto/err/err.c
+++ b/lib/libcrypto/err/err.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: err.c,v 1.50 2022/12/26 07:18:52 jmc Exp $ */
+/* $OpenBSD: err.c,v 1.51 2023/03/27 09:15:45 jan Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -580,6 +580,7 @@ build_SYS_str_reasons(void)
 	static char strerror_tab[NUM_SYS_STR_REASONS][LEN_SYS_STR_REASON];
 	int i;
 	static int init = 1;
+	int save_errno;
 
 	CRYPTO_r_lock(CRYPTO_LOCK_ERR);
 	if (!init) {
@@ -594,6 +595,8 @@ build_SYS_str_reasons(void)
 		return;
 	}
 
+	/* strerror(3) will set errno to EINVAL when i is an unknown errno. */
+	save_errno = errno;
 	for (i = 1; i <= NUM_SYS_STR_REASONS; i++) {
 		ERR_STRING_DATA *str = &SYS_str_reasons[i - 1];
 
@@ -610,6 +613,7 @@ build_SYS_str_reasons(void)
 		if (str->string == NULL)
 			str->string = "unknown";
 	}
+	errno = save_errno;
 
 	/* Now we still have SYS_str_reasons[NUM_SYS_STR_REASONS] = {0, NULL},
 	 * as required by ERR_load_strings. */
-- 
2.20.1