Fix bug #71498: Out-of-Bound Read in phar_parse_zipfile()

Author: smalyshev

ext/phar/tests/bug71488.phpt

@@ -7,6 +7,7 @@ Phar: bug #71488: Stack overflow when decompressing tar archives
 $p = new PharData(__DIR__."/bug71488.tar");
 $newp = $p->decompress("test");
 ?>
+
 DONE
 --CLEAN--
 <?php

ext/phar/tests/bug71498.phpt

@@ -0,0 +1,17 @@
+--TEST--
+Phar: bug #71498: Out-of-Bound Read in phar_parse_zipfile()
+--SKIPIF--
+<?php if (!extension_loaded("phar")) die("skip"); ?>
+--FILE--
+<?php
+try {
+$p = new PharData(__DIR__."/bug71498.zip");
+} catch(UnexpectedValueException $e) {
+	echo $e->getMessage();
+}
+?>
+
+DONE
+--EXPECTF--
+phar error: end of central directory not found in zip-based phar "%s/bug71498.zip"
+DONE

ext/phar/tests/bug71498.zip

@@ -159,7 +159,7 @@ static void phar_zip_u2d_time(time_t time, char *dtime, char *ddate) /* {{{ */
  *
  * Parse a new one and add it to the cache, returning either SUCCESS or
  * FAILURE, and setting pphar to the pointer to the manifest entry
- * 
+ *
  * This is used by phar_open_from_fp to process a zip-based phar, but can be called
  * directly.
  */
@@ -199,7 +199,7 @@ int phar_parse_zipfile(php_stream *fp, char *fname, int fname_len, char *alias,
 	}
 
 	while ((p=(char *) memchr(p + 1, 'P', (size_t) (size - (p + 1 - buf)))) != NULL) {
-		if (!memcmp(p + 1, "K\5\6", 3)) {
+		if ((p - buf) + sizeof(locator) <= size && !memcmp(p + 1, "K\5\6", 3)) {
 			memcpy((void *)&locator, (void *) p, sizeof(locator));
 			if (PHAR_GET_16(locator.centraldisk) != 0 || PHAR_GET_16(locator.disknumber) != 0) {
 				/* split archives not handled */
@@ -1161,7 +1161,7 @@ int phar_zip_flush(phar_archive_data *phar, char *user_stub, long len, int defau
 	static const char newstub[] = "<?php // zip-based phar archive stub file\n__HALT_COMPILER();";
 	char halt_stub[] = "__HALT_COMPILER();";
 	char *tmp;
-	
+
 	php_stream *stubfile, *oldfile;
 	php_serialize_data_t metadata_hash;
 	int free_user_stub, closeoldfile = 0;