1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
From 89084ce9e34ed38403f8cbb5d67e6299f1b1ab60 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 a8b39ee615..c4b5e031ed 100644
--- a/ext/standard/string.c
+++ b/ext/standard/string.c
@@ -4757,7 +4757,7 @@ 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 != '\\') {
@@ -4784,7 +4784,7 @@ 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 {
@@ -4811,7 +4811,7 @@ 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) ""
|
