gcrypt-util: fix memleak

src/basic/gcrypt-util.c

@@ -42,7 +42,7 @@ void initialize_libgcrypt(bool secmem) {
 }
 
 int string_hashsum(const char *s, size_t len, int md_algorithm, char **out) {
-        gcry_md_hd_t md = NULL;
+        _cleanup_(gcry_md_closep) gcry_md_hd_t md = NULL;
         size_t hash_size;
         void *hash;
         char *enc;

src/basic/gcrypt-util.h

@@ -20,6 +20,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#pragma once
+
 #include <errno.h>
 #include <stdbool.h>
 #include <stddef.h>
@@ -27,8 +29,12 @@
 #if HAVE_GCRYPT
 #include <gcrypt.h>
 
+#include "macro.h"
+
 void initialize_libgcrypt(bool secmem);
 int string_hashsum(const char *s, size_t len, int md_algorithm, char **out);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(gcry_md_hd_t, gcry_md_close);
 #endif
 
 static inline int string_hashsum_sha224(const char *s, size_t len, char **out) {