From cba8a7f1559f89f0da49406a43406b1a5570e954 Mon Sep 17 00:00:00 2001
From: Jacob Barthelmeh <jacob@wolfssl.com>
Date: Wed, 5 Jun 2019 08:13:35 +0700
Subject: [PATCH] free buffer when using small stack

---
 wolfcrypt/src/pkcs7.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/wolfcrypt/src/pkcs7.c b/wolfcrypt/src/pkcs7.c
index 6159bc44f..e33fcb7a7 100644
--- a/wolfcrypt/src/pkcs7.c
+++ b/wolfcrypt/src/pkcs7.c
@@ -3358,6 +3358,9 @@ static int wc_PKCS7_SignedDataVerifySignature(PKCS7* pkcs7, byte* sig,
             XMEMCPY(pkcs7->pkcs7Digest, pkcs7Digest, pkcs7DigestSz);
             pkcs7->pkcs7DigestSz = pkcs7DigestSz;
 
+            #ifdef WOLFSSL_SMALL_STACK
+            XFREE(pkcs7Digest, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
+            #endif
             return PKCS7_SIGNEEDS_CHECK;
         }
     }