libxml2: security fix CVE-2015-7942

includes:
CVE-2015-7942
CVE-2015-7942-2

(From OE-Core rev: 66c7e97f8687c1b656c322282ee7cdc200945616)

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/libxml/libxml2.inc

@@ -24,6 +24,8 @@ SRC_URI = "ftp://xmlsoft.org/libxml2/libxml2-${PV}.tar.gz;name=libtar \
            file://CVE-2015-7941-1-Stop-parsing-on-entities-boundaries-errors.patch \
            file://CVE-2015-7941-2-Cleanup-conditional-section-error-handling.patch \
            file://CVE-2015-8317-Fail-parsing-early-on-if-encoding-conversion-failed.patch \
+           file://CVE-2015-7942-Another-variation-of-overflow-in-Conditional-section.patch \
+           file://CVE-2015-7942-2-Fix-an-error-in-previous-Conditional-section-patch.patch \
           "
 
 BINCONFIG = "${bindir}/xml2-config"

meta/recipes-core/libxml/libxml2/CVE-2015-7942-2-Fix-an-error-in-previous-Conditional-section-patch.patch

@@ -0,0 +1,35 @@
+From 41ac9049a27f52e7a1f3b341f8714149fc88d450 Mon Sep 17 00:00:00 2001
+From: Daniel Veillard <veillard@redhat.com>
+Date: Tue, 27 Oct 2015 10:53:44 +0800
+Subject: [PATCH] Fix an error in previous Conditional section patch
+
+an off by one mistake in the change, led to error on correct
+document where the end of the included entity was exactly
+the end of the conditional section, leading to regtest failure
+
+Upstream-Status: Backport
+
+CVE-2015-7942-2
+
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ parser.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/parser.c b/parser.c
+index b9217ff..d67b300 100644
+--- a/parser.c
++++ b/parser.c
+@@ -6916,7 +6916,7 @@ xmlParseConditionalSections(xmlParserCtxtPtr ctxt) {
+ 				 NULL, NULL);
+ 	}
+ 	if ((ctxt-> instate != XML_PARSER_EOF) &&
+-	    ((ctxt->input->cur + 3) < ctxt->input->end))
++	    ((ctxt->input->cur + 3) <= ctxt->input->end))
+ 	    SKIP(3);
+     }
+ }
+-- 
+2.3.5
+

meta/recipes-core/libxml/libxml2/CVE-2015-7942-Another-variation-of-overflow-in-Conditional-section.patch

@@ -0,0 +1,39 @@
+From bd0526e66a56e75a18da8c15c4750db8f801c52d Mon Sep 17 00:00:00 2001
+From: Daniel Veillard <veillard@redhat.com>
+Date: Fri, 23 Oct 2015 19:02:28 +0800
+Subject: [PATCH] Another variation of overflow in Conditional sections
+
+Which happen after the previous fix to
+https://bugzilla.gnome.org/show_bug.cgi?id=756456
+
+But stopping the parser and exiting we didn't pop the intermediary entities
+and doing the SKIP there applies on an input which may be too small
+
+Upstream-Status: Backport
+
+CVE-2015-7942
+
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ parser.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/parser.c b/parser.c
+index a65e4cc..b9217ff 100644
+--- a/parser.c
++++ b/parser.c
+@@ -6915,7 +6915,9 @@ xmlParseConditionalSections(xmlParserCtxtPtr ctxt) {
+ 	"All markup of the conditional section is not in the same entity\n",
+ 				 NULL, NULL);
+ 	}
+-        SKIP(3);
++	if ((ctxt-> instate != XML_PARSER_EOF) &&
++	    ((ctxt->input->cur + 3) < ctxt->input->end))
++	    SKIP(3);
+     }
+ }
+ 
+-- 
+2.3.5
+