From e1ca9e1f6db97052a0ebea6591f323b12b1e0020 Mon Sep 17 00:00:00 2001
From: Bernd Edlinger <bernd.edlinger@hotmail.de>
Date: Sun, 9 Jul 2017 21:22:26 +0200
Subject: [PATCH] Fix crash in BUF_MEM_grow_clean.

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Ben Kaduk <kaduk@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/3896)
---
 crypto/buffer/buffer.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/crypto/buffer/buffer.c b/crypto/buffer/buffer.c
index 6b0bd4a404..ad7128a732 100644
--- a/crypto/buffer/buffer.c
+++ b/crypto/buffer/buffer.c
@@ -62,9 +62,11 @@ static char *sec_alloc_realloc(BUF_MEM *str, size_t len)
 
     ret = OPENSSL_secure_malloc(len);
     if (str->data != NULL) {
-        if (ret != NULL)
+        if (ret != NULL) {
             memcpy(ret, str->data, str->length);
-        OPENSSL_secure_free(str->data);
+            OPENSSL_secure_free(str->data);
+            str->data = NULL;
+        }
     }
     return (ret);
 }
-- 
2.34.1