Fixed bug #74873 (Minor BC break: PCRE_JIT changes output of preg_match()).

NEWS

@@ -21,6 +21,10 @@ PHP                                                                        NEWS
   . Fixed bug #74651 (negative-size-param (-1) in memcpy in zif_openssl_seal()).
     (Stas)
 
+- PCRE:
+  . Fixed bug #74873 (Minor BC break: PCRE_JIT changes output of preg_match()).
+    (Dmitry)
+
 06 Jul 2017, PHP 7.2.0alpha3
 
 - Core:

ext/pcre/php_pcre.c

@@ -826,6 +826,10 @@ PHPAPI void php_pcre_match_impl(pcre_cache_entry *pce, char *subject, int subjec
 #ifdef HAVE_PCRE_JIT_SUPPORT
 		if ((extra->flags & PCRE_EXTRA_EXECUTABLE_JIT)
 		 && no_utf_check && !g_notempty) {
+			if (start_offset < 0 || start_offset > subject_len) {
+				pcre_handle_exec_error(PCRE_ERROR_BADOFFSET);
+				break;
+			}
 			count = pcre_jit_exec(pce->re, extra, subject, (int)subject_len, (int)start_offset,
 						  no_utf_check|g_notempty, offsets, size_offsets, jit_stack);
 		} else

ext/pcre/tests/bug74873.phpt

@@ -0,0 +1,8 @@
+--TEST--
+Bug #74873 (Minor BC break: PCRE_JIT changes output of preg_match())
+--FILE--
+<?php
+var_dump(preg_match('/\S+/', 'foo bar', $matches, 0, 99999));
+?>
+--EXPECT--
+bool(false)