[Buildroot] [git commit branch/2019.02.x] package/libxml2: add upstream security fix for CVE-2020-7595
Peter Korsgaard
peter at korsgaard.com
Tue Mar 10 20:57:04 UTC 2020
commit: https://git.buildroot.net/buildroot/commit/?id=e135f475b40770f0c85b79957f86665c21e416ed
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2019.02.x
Fixes CVE-2020-7595: xmlStringLenDecodeEntities in parser.c in libxml2
2.9.10 has an infinite loop in a certain end-of-file situation.
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
(cherry picked from commit 615b7c4af59229a14a52f789ce4692dea1828ba3)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
...finite-loop-in-xmlStringLenDecodeEntities.patch | 36 ++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/package/libxml2/0001-Fix-infinite-loop-in-xmlStringLenDecodeEntities.patch b/package/libxml2/0001-Fix-infinite-loop-in-xmlStringLenDecodeEntities.patch
new file mode 100644
index 0000000000..a79adc3f85
--- /dev/null
+++ b/package/libxml2/0001-Fix-infinite-loop-in-xmlStringLenDecodeEntities.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.
+
+Fixes CVE-2020-7595: xmlStringLenDecodeEntities in parser.c in libxml2
+2.9.10 has an infinite loop in a certain end-of-file situation.
+
+Signed-off-by: Zhipeng Xie <xiezhipeng1 at huawei.com>
+Signed-off-by: Peter Korsgaard <peter at korsgaard.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] == '#')) {
+--
+2.20.1
+
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