Merge branch 'pull-request/76' into PHP-5.3

Author: nikic

ext/standard/tests/file/bug61961.phpt

@@ -0,0 +1,14 @@
+--TEST--
+Bug #61961 (file_get_content leaks when access empty file with max length)
+--FILE--
+<?php
+$tmp_empty_file = __FILE__ . ".tmp";
+file_put_contents($tmp_empty_file, "");
+
+var_dump(file_get_contents($tmp_empty_file, NULL, NULL, NULL, 10));
+unlink($tmp_empty_file);
+?>
+==DONE==
+--EXPECT--
+string(0) ""
+==DONE==

main/streams/streams.c

@@ -1366,7 +1366,12 @@ PHPAPI size_t _php_stream_copy_to_mem(php_stream *src, char **buf, size_t maxlen
 			len += ret;
 			ptr += ret;
 		}
-		*ptr = '\0';
+		if (len) {
+			*ptr = '\0';
+		} else {
+			pefree(*buf, persistent);
+			*buf = NULL;
+		}
 		return len;
 	}