From 958fec3b453c660e31e1f3ce8a3318c90b3c5b36 Mon Sep 17 00:00:00 2001
From: Daniel Pouzzner <douzzer@wolfssl.com>
Date: Tue, 10 Nov 2020 16:40:28 -0600
Subject: [PATCH] internal.c:ProcessPeerCerts(): fix a core.NullDereference
 detected by llvm9 and llvm11 scan-builds.

---
 src/internal.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/internal.c b/src/internal.c
index 1ed9448d2..16f868bfd 100644
--- a/src/internal.c
+++ b/src/internal.c
@@ -10729,6 +10729,9 @@ int ProcessPeerCerts(WOLFSSL* ssl, byte* input, word32* inOutIdx,
                 if (ssl->options.tls1_3) {
                     word16 extSz;
 
+                    if (args->exts == NULL) {
+                        ERROR_OUT(BUFFER_ERROR, exit_ppc);
+                    }
                     if ((args->idx - args->begin) + OPAQUE16_LEN > totalSz) {
                         ERROR_OUT(BUFFER_ERROR, exit_ppc);
                     }