From cd1a50bfb61190f8a98e3cb831616faa34c86993 Mon Sep 17 00:00:00 2001
From: Jacob Barthelmeh <jacob@wolfssl.com>
Date: Thu, 21 May 2020 11:19:17 -0600
Subject: [PATCH] add additional sanity check on pointer before free

---
 wolfcrypt/src/rsa.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/wolfcrypt/src/rsa.c b/wolfcrypt/src/rsa.c
index a441b61ba..98251eddc 100644
--- a/wolfcrypt/src/rsa.c
+++ b/wolfcrypt/src/rsa.c
@@ -1847,11 +1847,15 @@ static int wc_RsaFunctionSync(const byte* in, word32 inLen, byte* out,
             }
 
             if (ret == 0) {
-                if (XSecure_RsaPrivateDecrypt(&rsa, (u8*)in, inLen, out) != XST_SUCCESS) {
+                if (XSecure_RsaPrivateDecrypt(&rsa, (u8*)in, inLen, out) !=
+                        XST_SUCCESS) {
                     ret = BAD_STATE_E;
                 }
             }
-            XFREE(d, key->heap, DYNAMIC_TYPE_PRIVATE_KEY);
+
+            if (d != NULL) {
+                XFREE(d, key->heap, DYNAMIC_TYPE_PRIVATE_KEY);
+            }
         }
     #endif
         break;