From 480347d682bb31bd75e1fbf6ab00c7a5707fdfa1 Mon Sep 17 00:00:00 2001
From: Thomas Daubney <thomas.daubney@arm.com>
Date: Thu, 1 Feb 2024 19:00:26 +0000
Subject: [PATCH] Add mac not NULL check before calling memset

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
---
 library/psa_crypto.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index b6989127d4..90909243ca 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -2687,7 +2687,7 @@ exit:
         operation->mac_size = 0;
     }
 
-    if (mac_size > operation->mac_size) {
+    if ((mac != NULL) && (mac_size > operation->mac_size)) {
         memset(&mac[operation->mac_size], '!',
                mac_size - operation->mac_size);
     }