[oe-commits] [openembedded-core] 20/22: libxml2: fix CVE-2020-7595

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rpurdie pushed a commit to branch zeus
in repository openembedded-core.

commit 72a747f77f9fd051e054e679deacf537b4b7116f
Author: Anuj Mittal <anuj.mittal at intel.com>
AuthorDate: Fri Feb 21 23:00:31 2020 +0200

    libxml2: fix CVE-2020-7595
    
    (From OE-Core rev: f2f7aa9a495774fe5a2e3947584cb3503bd1eaf1)
    
    Signed-off-by: Anuj Mittal <anuj.mittal at intel.com>
    Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
    Signed-off-by: Adrian Bunk <bunk at stusta.de>
    Signed-off-by: Anuj Mittal <anuj.mittal at intel.com>
---
 .../libxml/libxml2/CVE-2020-7595.patch             | 36 ++++++++++++++++++++++
 meta/recipes-core/libxml/libxml2_2.9.9.bb          |  1 +
 2 files changed, 37 insertions(+)

diff --git a/meta/recipes-core/libxml/libxml2/CVE-2020-7595.patch b/meta/recipes-core/libxml/libxml2/CVE-2020-7595.patch
new file mode 100644
index 0000000..facfefd
--- /dev/null
+++ b/meta/recipes-core/libxml/libxml2/CVE-2020-7595.patch
@@ -0,0 +1,36 @@
+From 0e1a49c8907645d2e155f0d89d4d9895ac5112b5 Mon Sep 17 00:00:00 2001
+From: Zhipeng Xie <xiezhipeng1 at huawei.com>
+Date: Thu, 12 Dec 2019 17:30:55 +0800
+Subject: [PATCH] Fix infinite loop in xmlStringLenDecodeEntities
+
+When ctxt->instate == XML_PARSER_EOF,xmlParseStringEntityRef
+return NULL which cause a infinite loop in xmlStringLenDecodeEntities
+
+Found with libFuzzer.
+
+Signed-off-by: Zhipeng Xie <xiezhipeng1 at huawei.com>
+
+Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/libxml2/commit/0e1a49c89076]
+CVE: CVE-2020-7595
+Signed-off-by: Anuj Mittal <anuj.mittal at intel.com> 
+---
+ parser.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/parser.c b/parser.c
+index d1c31963..a34bb6cd 100644
+--- a/parser.c
++++ b/parser.c
+@@ -2646,7 +2646,8 @@ xmlStringLenDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
+     else
+         c = 0;
+     while ((c != 0) && (c != end) && /* non input consuming loop */
+-	   (c != end2) && (c != end3)) {
++           (c != end2) && (c != end3) &&
++           (ctxt->instate != XML_PARSER_EOF)) {
+ 
+ 	if (c == 0) break;
+         if ((c == '&') && (str[1] == '#')) {
+-- 
+2.24.1
+
diff --git a/meta/recipes-core/libxml/libxml2_2.9.9.bb b/meta/recipes-core/libxml/libxml2_2.9.9.bb
index c44a90b..5797dd6 100644
--- a/meta/recipes-core/libxml/libxml2_2.9.9.bb
+++ b/meta/recipes-core/libxml/libxml2_2.9.9.bb
@@ -21,6 +21,7 @@ SRC_URI = "http://www.xmlsoft.org/sources/libxml2-${PV}.tar.gz;name=libtar \
            file://0001-Make-ptest-run-the-python-tests-if-python-is-enabled.patch \
            file://fix-execution-of-ptests.patch \
            file://Fix-CVE-2019-19956.patch \
+           file://CVE-2020-7595.patch \
            "
 
 SRC_URI[libtar.md5sum] = "c04a5a0a042eaa157e8e8c9eabe76bd6"

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