From cf01d78e7ef546b934b0727da3ea372efe3ce94b Mon Sep 17 00:00:00 2001
From: ashesman <ashes.man@gmail.com>
Date: Thu, 17 Feb 2022 11:08:27 +1300
Subject: [PATCH] Update library/ssl_msg.c

Co-authored-by: Gilles Peskine <gilles.peskine@arm.com>
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
---
 library/ssl_msg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/ssl_msg.c b/library/ssl_msg.c
index 8d35c9c00..db0299eda 100644
--- a/library/ssl_msg.c
+++ b/library/ssl_msg.c
@@ -5429,7 +5429,7 @@ int mbedtls_ssl_read(mbedtls_ssl_context *ssl, unsigned char *buf, size_t len)
     n = (len < ssl->in_msglen)
         ? len : ssl->in_msglen;
 
-    if (buf) {
+    if (len != 0) {
         memcpy(buf, ssl->in_offt, n);
         ssl->in_msglen -= n;
     }