From 3e821c6f2b0863d0dec4c76dd761e8d12f5823a3 Mon Sep 17 00:00:00 2001
From: Anthony Hu <anthony@wolfssl.com>
Date: Thu, 22 Jun 2023 15:01:11 -0400
Subject: [PATCH] make sure that when TLSX_ALPN_GetRequest() returns data and
 dataSz are not pointing to junk.

---
 src/tls.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/tls.c b/src/tls.c
index 1be158e6b..d16dba684 100644
--- a/src/tls.c
+++ b/src/tls.c
@@ -1803,6 +1803,9 @@ int TLSX_ALPN_GetRequest(TLSX* extensions, void** data, word16 *dataSz)
     if (extensions == NULL || data == NULL || dataSz == NULL)
         return BAD_FUNC_ARG;
 
+    *data = NULL;
+    *dataSz = 0;
+
     extension = TLSX_Find(extensions, TLSX_APPLICATION_LAYER_PROTOCOL);
     if (extension == NULL) {
         WOLFSSL_MSG("TLS extension not found");
@@ -1813,8 +1816,6 @@ int TLSX_ALPN_GetRequest(TLSX* extensions, void** data, word16 *dataSz)
     alpn = (ALPN *)extension->data;
     if (alpn == NULL) {
         WOLFSSL_MSG("ALPN extension not found");
-        *data = NULL;
-        *dataSz = 0;
         WOLFSSL_ERROR_VERBOSE(WOLFSSL_FATAL_ERROR);
         return WOLFSSL_FATAL_ERROR;
     }