From 15221558926e7205ca9af363a8f9c9a82c2f2a09 Mon Sep 17 00:00:00 2001
From: Andras Fekete <andras@wolfssl.com>
Date: Fri, 28 Apr 2023 14:08:15 -0400
Subject: [PATCH] Should only move the index by the amount we wrote

---
 src/internal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/internal.c b/src/internal.c
index e7b10cc51..5326905d1 100644
--- a/src/internal.c
+++ b/src/internal.c
@@ -20908,7 +20908,7 @@ int BuildMessage(WOLFSSL* ssl, byte* output, int outSz, const byte* input,
             if (args->ivSz > 0) {
                 XMEMCPY(output + args->idx, args->iv,
                                         min(args->ivSz, MAX_IV_SZ));
-                args->idx += args->ivSz;
+                args->idx += min(args->ivSz, MAX_IV_SZ);
             }
             XMEMCPY(output + args->idx, input, inSz);
             args->idx += inSz;