From d0ffeba72e7100ea5af8a099660e90e74a4f1619 Mon Sep 17 00:00:00 2001
From: Marc Hoersken <info@marc-hoersken.de>
Date: Tue, 22 Dec 2015 13:36:56 +0100
Subject: [PATCH] wincng.c: fixed possible memory leak in _libssh2_wincng_hash

If _libssh2_wincng_hash_update failed _libssh2_wincng_hash_final
would never have been called before.

Reported by Zenju.
---
 src/wincng.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/src/wincng.c b/src/wincng.c
index 11dbbe3..6fa59d2 100755
--- a/src/wincng.c
+++ b/src/wincng.c
@@ -415,16 +415,15 @@ _libssh2_wincng_hash(unsigned char *data, unsigned long datalen,
                      unsigned char *hash, unsigned long hashlen)
 {
     _libssh2_wincng_hash_ctx ctx;
+    int ret;
 
-    if (!_libssh2_wincng_hash_init(&ctx, hAlg, hashlen, NULL, 0)) {
-        if (!_libssh2_wincng_hash_update(&ctx, data, datalen)) {
-            if (!_libssh2_wincng_hash_final(&ctx, hash)) {
-                return 0;
-            }
-        }
+    ret = _libssh2_wincng_hash_init(&ctx, hAlg, hashlen, NULL, 0);
+    if (!ret) {
+        ret = _libssh2_wincng_hash_update(&ctx, data, datalen);
+        ret |= _libssh2_wincng_hash_final(&ctx, hash);
     }
 
-    return -1;
+    return ret;
 }