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CVE-2021-46143 expat: Integer overflow in doProlog in xmlparse.c

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Resolves: CVE-2021-46143
This commit is contained in:
Tomas Korbar 2022-02-09 15:04:03 +01:00
parent 4ccf989c09
commit d183ecbb95
2 changed files with 50 additions and 1 deletions
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43
expat-2.2.10-Prevent-integer-overflow-on-m_groupSize-in-function.patch Normal file
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@ -0,0 +1,43 @@
From 85ae9a2d7d0e9358f356b33977b842df8ebaec2b Mon Sep 17 00:00:00 2001
From: Sebastian Pipping <sebastian@pipping.org>
Date: Sat, 25 Dec 2021 20:52:08 +0100
Subject: [PATCH] lib: Prevent integer overflow on m_groupSize in function
doProlog (CVE-2021-46143)
---
expat/lib/xmlparse.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/lib/xmlparse.c b/lib/xmlparse.c
index b47c31b0..8f243126 100644
--- a/lib/xmlparse.c
+++ b/lib/xmlparse.c
@@ -5046,6 +5046,11 @@ doProlog(XML_Parser parser, const ENCODING *enc, const char *s, const char *end,
if (parser->m_prologState.level >= parser->m_groupSize) {
if (parser->m_groupSize) {
{
+ /* Detect and prevent integer overflow */
+ if (parser->m_groupSize > (unsigned int)(-1) / 2u) {
+ return XML_ERROR_NO_MEMORY;
+ }
+
char *const new_connector = (char *)REALLOC(
parser, parser->m_groupConnector, parser->m_groupSize *= 2);
if (new_connector == NULL) {
@@ -5056,6 +5061,16 @@ doProlog(XML_Parser parser, const ENCODING *enc, const char *s, const char *end,
}
if (dtd->scaffIndex) {
+ /* Detect and prevent integer overflow.
+ * The preprocessor guard addresses the "always false" warning
+ * from -Wtype-limits on platforms where
+ * sizeof(unsigned int) < sizeof(size_t), e.g. on x86_64. */
+#if UINT_MAX >= SIZE_MAX
+ if (parser->m_groupSize > (size_t)(-1) / sizeof(int)) {
+ return XML_ERROR_NO_MEMORY;
+ }
+#endif
+
int *const new_scaff_index = (int *)REALLOC(
parser, dtd->scaffIndex, parser->m_groupSize * sizeof(int));
if (new_scaff_index == NULL)

8
expat.spec
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@ -3,7 +3,7 @@
Summary: An XML parser library
Name: expat
Version: %(echo %{unversion} | sed 's/_/./g')
Release: 6%{?dist}
Release: 7%{?dist}
Source: https://github.com/libexpat/libexpat/archive/R_%{unversion}.tar.gz#/expat-%{version}.tar.gz
URL: https://libexpat.github.io/
License: MIT
@ -11,6 +11,7 @@ BuildRequires: autoconf, libtool, xmlto, gcc-c++
BuildRequires: make
Patch0: expat-2.2.10-prevent-integer-overflow-in-doProlog.patch
Patch1: expat-2.2.10-Prevent-more-integer-overflows.patch
Patch2: expat-2.2.10-Prevent-integer-overflow-on-m_groupSize-in-function.patch
%description
This is expat, the C library for parsing XML, written by James Clark. Expat
@ -40,6 +41,7 @@ Install it if you need to link statically with expat.
%setup -q -n libexpat-R_%{unversion}/expat
%patch0 -p1 -b .CVE-2022-23990
%patch1 -p1 -b .CVE-2022-22822-CVE-2022-22827
%patch2 -p1 -b .CVE-2021-46143
sed -i 's/install-data-hook/do-nothing-please/' lib/Makefile.am
./buildconf.sh
@ -76,6 +78,10 @@ make check
%{_libdir}/lib*.a
%changelog
* Wed Feb 09 2022 Tomas Korbar <tkorbar@redhat.com> - 2.2.10-7
- CVE-2021-46143 expat: Integer overflow in doProlog in xmlparse.c
- Resolves: CVE-2021-46143
* Wed Feb 09 2022 Tomas Korbar <tkorbar@redhat.com> - 2.2.10-6
- CVE-2022-22827 Integer overflow in storeAtts in xmlparse.c
- CVE-2022-22826 Integer overflow in nextScaffoldPart in xmlparse.c