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From f18f20c032482e34d5f94d747da16f8ae029a017 Mon Sep 17 00:00:00 2001
From: Stanislav Malyshev <stas@php.net>
Date: Mon, 20 Jan 2020 21:33:17 -0800
Subject: [PATCH] Fix #79099: OOB read in php_strip_tags_ex
(cherry picked from commit 0f79b1bf301f455967676b5129240140c5c45b09)
---
ext/standard/string.c | 6 ++---
ext/standard/tests/file/bug79099.phpt | 32 +++++++++++++++++++++++++++
2 files changed, 35 insertions(+), 3 deletions(-)
create mode 100644 ext/standard/tests/file/bug79099.phpt
diff --git a/ext/standard/string.c b/ext/standard/string.c
index 922d4fceaf..c88135da6f 100644
--- a/ext/standard/string.c
+++ b/ext/standard/string.c
@@ -4781,7 +4781,7 @@ PHPAPI size_t php_strip_tags_ex(char *rbuf, size_t len, int *stateptr, const cha
if (state == 4) {
/* Inside <!-- comment --> */
break;
- } else if (state == 2 && *(p-1) != '\\') {
+ } else if (state == 2 && p >= buf + 1 && *(p-1) != '\\') {
if (lc == c) {
lc = '\0';
} else if (lc != '\\') {
@@ -4808,7 +4808,7 @@ PHPAPI size_t php_strip_tags_ex(char *rbuf, size_t len, int *stateptr, const cha
case '!':
/* JavaScript & Other HTML scripting languages */
- if (state == 1 && *(p-1) == '<') {
+ if (state == 1 && p >= buf + 1 && *(p-1) == '<') {
state = 3;
lc = c;
} else {
@@ -4835,7 +4835,7 @@ PHPAPI size_t php_strip_tags_ex(char *rbuf, size_t len, int *stateptr, const cha
case '?':
- if (state == 1 && *(p-1) == '<') {
+ if (state == 1 && p >= buf + 1 && *(p-1) == '<') {
br=0;
state=2;
break;
diff --git a/ext/standard/tests/file/bug79099.phpt b/ext/standard/tests/file/bug79099.phpt
new file mode 100644
index 0000000000..7c842f4654
--- /dev/null
+++ b/ext/standard/tests/file/bug79099.phpt
@@ -0,0 +1,32 @@
+--TEST--
+Bug #79099 (OOB read in php_strip_tags_ex)
+--FILE--
+<?php
+$stream = fopen('php://memory', 'w+');
+fputs($stream, "<?\n\"\n");
+rewind($stream);
+var_dump(fgetss($stream));
+var_dump(fgetss($stream));
+fclose($stream);
+
+$stream = fopen('php://memory', 'w+');
+fputs($stream, "<\0\n!\n");
+rewind($stream);
+var_dump(fgetss($stream));
+var_dump(fgetss($stream));
+fclose($stream);
+
+$stream = fopen('php://memory', 'w+');
+fputs($stream, "<\0\n?\n");
+rewind($stream);
+var_dump(fgetss($stream));
+var_dump(fgetss($stream));
+fclose($stream);
+?>
+--EXPECT--
+string(0) ""
+string(0) ""
+string(0) ""
+string(0) ""
+string(0) ""
+string(0) ""
From a9620f5c7f2d55ca90552d3eb44d0980f10deec3 Mon Sep 17 00:00:00 2001
From: Stanislav Malyshev <stas@php.net>
Date: Wed, 22 Jan 2020 22:36:53 -0800
Subject: [PATCH] More checks for php_strip_tags_ex
(cherry picked from commit 2dc170e25d86a725fefd4c08f2bd8378820b28f5)
---
ext/standard/string.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/ext/standard/string.c b/ext/standard/string.c
index c88135da6f..018e919cbf 100644
--- a/ext/standard/string.c
+++ b/ext/standard/string.c
@@ -4731,7 +4731,7 @@ PHPAPI size_t php_strip_tags_ex(char *rbuf, size_t len, int *stateptr, const cha
switch (state) {
case 1: /* HTML/XML */
lc = '>';
- if (is_xml && *(p -1) == '-') {
+ if (is_xml && p >= buf + 1 && *(p-1) == '-') {
break;
}
in_q = state = is_xml = 0;
@@ -4752,7 +4752,7 @@ PHPAPI size_t php_strip_tags_ex(char *rbuf, size_t len, int *stateptr, const cha
break;
case 2: /* PHP */
- if (!br && lc != '\"' && *(p-1) == '?') {
+ if (!br && lc != '\"' && p >= buf + 1 && *(p-1) == '?') {
in_q = state = 0;
tp = tbuf;
}
|
