From: Steve Sakoman <st...@sakoman.com> In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for m_groupSize.
Backport patch from: https://github.com/libexpat/libexpat/pull/538/commits/85ae9a2d7d0e9358f356b33977b842df8ebaec2b CVE: CVE-2021-46143 Signed-off-by: Steve Sakoman <st...@sakoman.com> (cherry picked from commit 41a65d27e4ecdc11977e2944d8af2f51c48f32ec) Signed-off-by: Anuj Mittal <anuj.mit...@intel.com> --- .../expat/expat/CVE-2021-46143.patch | 43 +++++++++++++++++++ meta/recipes-core/expat/expat_2.2.10.bb | 1 + 2 files changed, 44 insertions(+) create mode 100644 meta/recipes-core/expat/expat/CVE-2021-46143.patch 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..d6bafba0ff --- /dev/null +++ b/meta/recipes-core/expat/expat/CVE-2021-46143.patch @@ -0,0 +1,43 @@ +From 85ae9a2d7d0e9358f356b33977b842df8ebaec2b Mon Sep 17 00:00:00 2001 +From: Sebastian Pipping <sebast...@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/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) diff --git a/meta/recipes-core/expat/expat_2.2.10.bb b/meta/recipes-core/expat/expat_2.2.10.bb index 7a892b0304..e5415361d8 100644 --- a/meta/recipes-core/expat/expat_2.2.10.bb +++ b/meta/recipes-core/expat/expat_2.2.10.bb @@ -14,6 +14,7 @@ SRC_URI = "https://github.com/libexpat/libexpat/releases/download/R_${VERSION_TA file://0001-Add-output-of-tests-result.patch \ file://CVE-2022-22822-27.patch \ file://CVE-2021-45960.patch \ + file://CVE-2021-46143.patch \ " UPSTREAM_CHECK_URI = "https://github.com/libexpat/libexpat/releases/"; -- 2.34.1
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