1 files changed, 49 insertions, 0 deletions

diff --git a/meta/recipes-core/expat/expat/CVE-2021-46143.patch b/meta/recipes-core/expat/expat/CVE-2021-46143.patch
new file mode 100644
index 0000000000..b1a726d9a8
--- /dev/null
+++ b/meta/recipes-core/expat/expat/CVE-2021-46143.patch
@@ -0,0 +1,49 @@
+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)
+
+Upstream-Status: Backport:
+https://github.com/libexpat/libexpat/pull/538/commits/85ae9a2d7d0e9358f356b33977b842df8ebaec2b
+
+CVE: CVE-2021-46143
+
+Signed-off-by: Steve Sakoman <steve@sakoman.com>
+---
+ expat/lib/xmlparse.c | 15 +++++++++++++++
+ 1 file changed, 15 insertions(+)
+
+diff --git a/expat/lib/xmlparse.c b/expat/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)