From: Ilia Alshanetsky <iliaa@php.net>
Date: Mon, 1 Feb 2010 12:59:08 +0000 (+0000)
Subject: Fixed bug #50847 (strip_tags() removes all tags greater then 1023 bytes long)
X-Git-Tag: php-5.2.13RC2~21
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=24e831b7ebf505d79ea6ef3d6edd79b147f41ef3;p=php

Fixed bug #50847 (strip_tags() removes all tags greater then 1023 bytes long)
---

diff --git a/NEWS b/NEWS
index 3a3089300b..d2a9ca2895 100644
--- a/NEWS
+++ b/NEWS
@@ -4,6 +4,8 @@ PHP                                                                        NEWS
 - Fixed a possible open_basedir/safe_mode bypass in session extension
   identified by Grzegorz Stachowiak. (Ilia)
 
+- Fixed bug #50847 (strip_tags() removes all tags greater then 1023 bytes
+  long). (Ilia)
 - Fixed bug #50727 (Accesing mysqli->affected_rows on no connection causes
   segfault). (Andrey, Johannes)
 
diff --git a/ext/standard/string.c b/ext/standard/string.c
index 1f9577157e..694c0a5fb0 100644
--- a/ext/standard/string.c
+++ b/ext/standard/string.c
@@ -4335,7 +4335,7 @@ PHPAPI size_t php_strip_tags_ex(char *rbuf, int len, int *stateptr, char *allow,
 {
 	char *tbuf, *buf, *p, *tp, *rp, c, lc;
 	int br, i=0, depth=0, in_q = 0;
-	int state = 0;
+	int state = 0, pos;
 
 	if (stateptr)
 		state = *stateptr;
@@ -4348,7 +4348,7 @@ PHPAPI size_t php_strip_tags_ex(char *rbuf, int len, int *stateptr, char *allow,
 	br = 0;
 	if (allow) {
 		php_strtolower(allow, allow_len);
-		tbuf = emalloc(PHP_TAG_BUF_SIZE+1);
+		tbuf = emalloc(PHP_TAG_BUF_SIZE + 1);
 		tp = tbuf;
 	} else {
 		tbuf = tp = NULL;
@@ -4369,7 +4369,11 @@ PHPAPI size_t php_strip_tags_ex(char *rbuf, int len, int *stateptr, char *allow,
 					lc = '<';
 					state = 1;
 					if (allow) {
-						tp = ((tp-tbuf) >= PHP_TAG_BUF_SIZE ? tbuf: tp);
+						if (tp - tbuf >= PHP_TAG_BUF_SIZE) {
+							pos = tp - tbuf;
+							tbuf = erealloc(tbuf, (tp - tbuf) + PHP_TAG_BUF_SIZE + 1);
+							tp = tbuf + pos;
+						}
 						*(tp++) = '<';
 				 	}
 				} else if (state == 1) {
@@ -4384,7 +4388,11 @@ PHPAPI size_t php_strip_tags_ex(char *rbuf, int len, int *stateptr, char *allow,
 						br++;
 					}
 				} else if (allow && state == 1) {
-					tp = ((tp-tbuf) >= PHP_TAG_BUF_SIZE ? tbuf: tp);
+					if (tp - tbuf >= PHP_TAG_BUF_SIZE) {
+						pos = tp - tbuf;
+						tbuf = erealloc(tbuf, (tp - tbuf) + PHP_TAG_BUF_SIZE + 1);
+						tp = tbuf + pos;
+					}
 					*(tp++) = c;
 				} else if (state == 0) {
 					*(rp++) = c;
@@ -4398,7 +4406,11 @@ PHPAPI size_t php_strip_tags_ex(char *rbuf, int len, int *stateptr, char *allow,
 						br--;
 					}
 				} else if (allow && state == 1) {
-					tp = ((tp-tbuf) >= PHP_TAG_BUF_SIZE ? tbuf: tp);
+					if (tp - tbuf >= PHP_TAG_BUF_SIZE) {
+						pos = tp - tbuf;
+						tbuf = erealloc(tbuf, (tp - tbuf) + PHP_TAG_BUF_SIZE + 1);
+						tp = tbuf + pos;
+					}
 					*(tp++) = c;
 				} else if (state == 0) {
 					*(rp++) = c;
@@ -4420,7 +4432,11 @@ PHPAPI size_t php_strip_tags_ex(char *rbuf, int len, int *stateptr, char *allow,
 						lc = '>';
 						in_q = state = 0;
 						if (allow) {
-							tp = ((tp-tbuf) >= PHP_TAG_BUF_SIZE ? tbuf: tp);
+							if (tp - tbuf >= PHP_TAG_BUF_SIZE) {
+								pos = tp - tbuf;
+								tbuf = erealloc(tbuf, (tp - tbuf) + PHP_TAG_BUF_SIZE + 1);
+								tp = tbuf + pos;
+							}
 							*(tp++) = '>';
 							*tp='\0';
 							if (php_tag_find(tbuf, tp-tbuf, allow)) {
@@ -4467,7 +4483,11 @@ PHPAPI size_t php_strip_tags_ex(char *rbuf, int len, int *stateptr, char *allow,
 				} else if (state == 0) {
 					*(rp++) = c;
 				} else if (allow && state == 1) {
-					tp = ((tp-tbuf) >= PHP_TAG_BUF_SIZE ? tbuf: tp);
+					if (tp - tbuf >= PHP_TAG_BUF_SIZE) {
+						pos = tp - tbuf;
+						tbuf = erealloc(tbuf, (tp - tbuf) + PHP_TAG_BUF_SIZE + 1);
+						tp = tbuf + pos;
+					}
 					*(tp++) = c;
 				}
 				if (state && p != buf && (state == 1 || *(p-1) != '\\') && (!in_q || *p == in_q)) {
@@ -4488,7 +4508,11 @@ PHPAPI size_t php_strip_tags_ex(char *rbuf, int len, int *stateptr, char *allow,
 					if (state == 0) {
 						*(rp++) = c;
 					} else if (allow && state == 1) {
-						tp = ((tp-tbuf) >= PHP_TAG_BUF_SIZE ? tbuf: tp);
+						if (tp - tbuf >= PHP_TAG_BUF_SIZE) {
+							pos = tp - tbuf;
+							tbuf = erealloc(tbuf, (tp - tbuf) + PHP_TAG_BUF_SIZE + 1);
+							tp = tbuf + pos;
+						}
 						*(tp++) = c;
 					}
 				}
@@ -4543,7 +4567,11 @@ reg_char:
 				if (state == 0) {
 					*(rp++) = c;
 				} else if (allow && state == 1) {
-					tp = ((tp-tbuf) >= PHP_TAG_BUF_SIZE ? tbuf: tp);
+					if (tp - tbuf >= PHP_TAG_BUF_SIZE) {
+						pos = tp - tbuf;
+						tbuf = erealloc(tbuf, (tp - tbuf) + PHP_TAG_BUF_SIZE + 1);
+						tp = tbuf + pos;
+					}
 					*(tp++) = c;
 				} 
 				break;
diff --git a/ext/standard/tests/strings/bug50847.phpt b/ext/standard/tests/strings/bug50847.phpt
new file mode 100644
index 0000000000..28e83f5111
--- /dev/null
+++ b/ext/standard/tests/strings/bug50847.phpt
@@ -0,0 +1,10 @@
+--TEST--
+Bug #50847 (strip_tags() removes all tags greater then 1023 bytes long)
+--FILE--
+<?php
+$var = '<param value="' . str_repeat("a", 2048) . '" />';
+var_dump(strip_tags($var, "<param>"), strip_tags($var));
+?>
+--EXPECT--
+string(2066) "<param value="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" />"
+string(0) ""