44 lines
1.7 KiB
Diff
44 lines
1.7 KiB
Diff
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)
|