diff --git a/ChangeLog b/ChangeLog
index bcb07fbe..e7115059 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,10 @@
         * lib/groupio.c: add newline char when two lines
           are concatenated
 	  Closes: alioth#313942
+	* lib/groupio.c: fix uninitialised memory in
+          merge_group_entries causes segfault in useradd by changing
+	  a call to malloc to a call to calloc
+	  Closes: alioth:#313940
 
 2013-07-28  Guido Trentalancia  <guido@trentalancia.com>
 
diff --git a/lib/groupio.c b/lib/groupio.c
index 244307fc..5e89f5d7 100644
--- a/lib/groupio.c
+++ b/lib/groupio.c
@@ -353,7 +353,7 @@ static /*@null@*/struct commonio_entry *merge_group_entries (
 			members++;
 		}
 	}
-	new_members = (char **)malloc ( (members+1) * sizeof(char*) );
+	new_members = (char **)calloc ( (members+1), sizeof(char*) );
 	if (NULL == new_members) {
 		free (new_line);
 		errno = ENOMEM;