cipher_null.c: add NULL check

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: David von Oheimb <david.von.oheimb@siemens.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22903)

diff --git a/providers/implementations/ciphers/cipher_null.c b/providers/implementations/ciphers/cipher_null.c
index c911049e2d0b7b1643decb5c3070725145a6793a..81f9fa10be47391e7ec8ef004a787553314dcc1a 100644 (file)
--- a/providers/implementations/ciphers/cipher_null.c
+++ b/providers/implementations/ciphers/cipher_null.c
@@ -82,7 +82,7 @@ static int null_cipher(void *vctx, unsigned char *out, size_t *outl,
     }
     if (outsize < inl)
         return 0;
-    if (in != out)
+    if (out != NULL && in != out)
         memcpy(out, in, inl);
     *outl = inl;
     return 1;