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authorTony Tascioglu <tony.tascioglu@windriver.com>2021-05-14 09:14:50 -0400
committerRichard Purdie <richard.purdie@linuxfoundation.org>2021-05-22 10:01:16 +0100
commit6d69f7453f78dcb19f472dcea183e859648c5243 (patch)
tree774ae6d1e2a16f6dff4481033a8b0e49f4b7d429
parent490cddd7baf1aacb814128b611aabf82fda3e77b (diff)
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libxml2: fix CVE-2021-3537
Parsing specially crafted Mixed Content while parsing XML data may lead to invalid data structure being created, as errors were not propagated. This could lead to several NULL Pointer Dereference when post-validating documents parsed in recovery mode. CVE: CVE-2021-3537 Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/libxml2/-/commit/babe75030c7f64a37826bb3342317134568bef61] Signed-off-by: Tony Tascioglu <tony.tascioglu@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
-rw-r--r--meta/recipes-core/libxml/libxml2/CVE-2021-3537.patch49
-rw-r--r--meta/recipes-core/libxml/libxml2_2.9.10.bb1
2 files changed, 50 insertions, 0 deletions
diff --git a/meta/recipes-core/libxml/libxml2/CVE-2021-3537.patch b/meta/recipes-core/libxml/libxml2/CVE-2021-3537.patch
new file mode 100644
index 0000000000..defbe7867b
--- /dev/null
+++ b/meta/recipes-core/libxml/libxml2/CVE-2021-3537.patch
@@ -0,0 +1,49 @@
+From 5ae9c39401f679648301efa6d2d35e09cc376462 Mon Sep 17 00:00:00 2001
+From: Nick Wellnhofer <wellnhofer@aevum.de>
+Date: Sat, 1 May 2021 16:53:33 +0200
+Subject: [PATCH 3/3] Propagate error in xmlParseElementChildrenContentDeclPriv
+
+Check return value of recursive calls to
+xmlParseElementChildrenContentDeclPriv and return immediately in case
+of errors. Otherwise, struct xmlElementContent could contain unexpected
+null pointers, leading to a null deref when post-validating documents
+which aren't well-formed and parsed in recovery mode.
+
+Fixes #243.
+
+CVE: CVE-2021-3537
+Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/libxml2/-/commit/babe75030c7f64a37826bb3342317134568bef61]
+
+Signed-off-by: Tony Tascioglu <tony.tascioglu@windriver.com>
+---
+ parser.c | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/parser.c b/parser.c
+index a34bb6cd..bbcff39f 100644
+--- a/parser.c
++++ b/parser.c
+@@ -6195,6 +6195,8 @@ xmlParseElementChildrenContentDeclPriv(xmlParserCtxtPtr ctxt, int inputchk,
+ SKIP_BLANKS;
+ cur = ret = xmlParseElementChildrenContentDeclPriv(ctxt, inputid,
+ depth + 1);
++ if (cur == NULL)
++ return(NULL);
+ SKIP_BLANKS;
+ GROW;
+ } else {
+@@ -6328,6 +6330,11 @@ xmlParseElementChildrenContentDeclPriv(xmlParserCtxtPtr ctxt, int inputchk,
+ SKIP_BLANKS;
+ last = xmlParseElementChildrenContentDeclPriv(ctxt, inputid,
+ depth + 1);
++ if (last == NULL) {
++ if (ret != NULL)
++ xmlFreeDocElementContent(ctxt->myDoc, ret);
++ return(NULL);
++ }
+ SKIP_BLANKS;
+ } else {
+ elem = xmlParseName(ctxt);
+--
+2.25.1
+
diff --git a/meta/recipes-core/libxml/libxml2_2.9.10.bb b/meta/recipes-core/libxml/libxml2_2.9.10.bb
index 6f1229c2d0..b850164285 100644
--- a/meta/recipes-core/libxml/libxml2_2.9.10.bb
+++ b/meta/recipes-core/libxml/libxml2_2.9.10.bb
@@ -26,6 +26,7 @@ SRC_URI = "http://www.xmlsoft.org/sources/libxml2-${PV}.tar.gz;name=libtar \
file://fix-python39.patch \
file://CVE-2021-3517.patch \
file://CVE-2021-3516.patch \
+ file://CVE-2021-3537.patch \
"
SRC_URI[libtar.md5sum] = "10942a1dc23137a8aa07f0639cbfece5"