From aa05eb2879b0b1a5b6b630314bf51a1cb89b5ba6 Mon Sep 17 00:00:00 2001
From: Daniel Pouzzner <douzzer@wolfssl.com>
Date: Mon, 27 Dec 2021 17:59:28 -0600
Subject: [PATCH] wolfcrypt/src/evp.c: fix wolfSSL_EVP_CIPHER_CTX_ctrl() null
 pointer passed to XMEMCPY(), found by sanitizers under gcc-11.2.1.

---
 wolfcrypt/src/evp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/wolfcrypt/src/evp.c b/wolfcrypt/src/evp.c
index d1e328cc3..3db06bf1b 100644
--- a/wolfcrypt/src/evp.c
+++ b/wolfcrypt/src/evp.c
@@ -4817,7 +4817,8 @@ int wolfSSL_EVP_MD_type(const WOLFSSL_EVP_MD* type)
                 /* OpenSSL increments the IV. Not sure why */
                 IncCtr(ctx->iv, ctx->ivSz);
                 /* Clear any leftover AAD. */
-                XMEMSET(ctx->gcmAuthIn, 0, ctx->gcmAuthInSz);
+                if (ctx->gcmAuthIn != NULL)
+                    XMEMSET(ctx->gcmAuthIn, 0, ctx->gcmAuthInSz);
                 ctx->gcmAuthInSz = 0;
                 ret = WOLFSSL_SUCCESS;
                 break;