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-rw-r--r--lib/libcrypto/pem/pem_lib.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/lib/libcrypto/pem/pem_lib.c b/lib/libcrypto/pem/pem_lib.c
index 7b7f81092e2..7076023ebac 100644
--- a/lib/libcrypto/pem/pem_lib.c
+++ b/lib/libcrypto/pem/pem_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: pem_lib.c,v 1.50 2021/12/12 21:30:14 tb Exp $ */
+/* $OpenBSD: pem_lib.c,v 1.51 2022/07/31 09:48:27 tb Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
@@ -608,8 +608,7 @@ PEM_write_bio(BIO *bp, const char *name, const char *header,
(BIO_write(bp, "-----\n", 6) != 6))
goto err;
- i = strlen(header);
- if (i > 0) {
+ if (header != NULL && (i = strlen(header)) > 0) {
if ((BIO_write(bp, header, i) != i) ||
(BIO_write(bp, "\n", 1) != 1))
goto err;