ecryptfs: Replace memcpy + NUL termination in ecryptfs_copy_filename

Use kmemdup_nul() to copy 'name' instead of using memcpy() followed by a
manual NUL termination.  Remove the local return variable and the goto
label to simplify the code.  No functional changes.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Acked-by: Tyler Hicks <code@tyhicks.com>
Signed-off-by: Tyler Hicks <code@tyhicks.com>

Author: toblux

fs/ecryptfs/crypto.c

@@ -1418,21 +1418,11 @@ ecryptfs_encrypt_filename(struct ecryptfs_filename *filename,
 static int ecryptfs_copy_filename(char **copied_name, size_t *copied_name_size,
 				  const char *name, size_t name_size)
 {
-	int rc = 0;
-
-	(*copied_name) = kmalloc((name_size + 1), GFP_KERNEL);
-	if (!(*copied_name)) {
-		rc = -ENOMEM;
-		goto out;
-	}
-	memcpy((void *)(*copied_name), (void *)name, name_size);
-	(*copied_name)[(name_size)] = '\0';	/* Only for convenience
-						 * in printing out the
-						 * string in debug
-						 * messages */
+	(*copied_name) = kmemdup_nul(name, name_size, GFP_KERNEL);
+	if (!(*copied_name))
+		return -ENOMEM;
 	(*copied_name_size) = name_size;
-out:
-	return rc;
+	return 0;
 }
 
 /**