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Fixes segfault occurrence in PEM_write()

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Checks if header is NULL or not before calling strlen().

CLA: trivial

Fixes #18825

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Ben Kaduk <kaduk@mit.edu>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18865)
This commit is contained in:
valdaarhun 2022-07-25 18:49:19 +05:30 committed by Pauli
parent df274c334c
commit 205957405d
1 changed files with 1 additions and 1 deletions
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2
crypto/pem/pem_lib.c
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@ -624,7 +624,7 @@ int PEM_write_bio(BIO *bp, const char *name, const char *header,
(BIO_write(bp, "-----\n", 6) != 6))
goto err;
i = strlen(header);
i = header != NULL ? strlen(header) : 0;
if (i > 0) {
if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
goto err;