[PATCH] * avoid double-free on gcry_hmac256_finalize(gcry_hmac256_new) failure

[Joshua Rogers]

* src/hmac256.c (gcry_hmac256_new): if gcry_hmac256_finalize
fails, avoid double-free of hd.
--

Signed-off-by: Joshua Rogers <git at internot.info>
---
 src/hmac256.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/hmac256.c b/src/hmac256.c
index 94a26da..7fbd321 100644
--- a/src/hmac256.c
+++ b/src/hmac256.c
@@ -496,7 +496,8 @@ _gcry_hmac256_file (void *result, size_t resultsize, const char *filename,
   digest = _gcry_hmac256_finalize (hd, &digestlen);
   if (!digest)
     {
-      _gcry_hmac256_release (hd);
+      if(hd)
+        _gcry_hmac256_release (hd);
       return -1;
     }
 
-- 
1.9.1