From 9c245b7fc597cc428ae630c2cf0a2a182bbd1a56 Mon Sep 17 00:00:00 2001
From: John Safranek <john@wolfssl.com>
Date: Tue, 16 Jul 2019 15:44:45 -0700
Subject: [PATCH] Fixes When building with GCC-8 and enable-intelasm set, GCC
 reported a memcpy from and two the same pointer being possible. Added a check
 for the same pointer and skipped the copy if the same.

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

diff --git a/wolfcrypt/src/aes.c b/wolfcrypt/src/aes.c
index e12a2d258..1d246cb6d 100644
--- a/wolfcrypt/src/aes.c
+++ b/wolfcrypt/src/aes.c
@@ -1628,7 +1628,8 @@ static void wc_AesDecrypt(Aes* aes, const byte* inBlock, byte* outBlock)
         #endif
 
         /* if input and output same will overwrite input iv */
-        XMEMCPY(aes->tmp, inBlock, AES_BLOCK_SIZE);
+        if ((const byte*)aes->tmp != inBlock)
+            XMEMCPY(aes->tmp, inBlock, AES_BLOCK_SIZE);
         AES_ECB_decrypt(inBlock, outBlock, AES_BLOCK_SIZE, (byte*)aes->key,
                         aes->rounds);
         return;