From d7e33b329304e9855b7e4b22ad38aef82f415124 Mon Sep 17 00:00:00 2001
From: Daniel Pouzzner <douzzer@wolfssl.com>
Date: Thu, 4 Aug 2022 11:12:09 -0500
Subject: [PATCH] wolfcrypt/src/asn.c: fix null pointer deref in
 SetReqAttribSingle() (clang-analyzer-core.NonNullParamChecker).

---
 wolfcrypt/src/asn.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/wolfcrypt/src/asn.c b/wolfcrypt/src/asn.c
index aca9132e7..c87589707 100644
--- a/wolfcrypt/src/asn.c
+++ b/wolfcrypt/src/asn.c
@@ -26227,8 +26227,10 @@ static int SetReqAttribSingle(byte* output, int* idx, char* attr, int attrSz,
         if (strSz > 0) {
             XMEMCPY(&output[*idx], str, strSz);
             *idx += strSz;
-            XMEMCPY(&output[*idx], attr, attrSz);
-            *idx += attrSz;
+            if (attrSz > 0) {
+                XMEMCPY(&output[*idx], attr, attrSz);
+                *idx += attrSz;
+            }
         }
     }
     return totalSz;