File libxml2-CVE-2017-5969.patch of Package libxml2

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File libxml2-CVE-2017-5969.patch of Package libxml2 (Revision a698e4ad231ec000622a7a7ffaf296e5)

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From 94691dc884d1a8ada39f073408b4bb92fe7fe882 Mon Sep 17 00:00:00 2001
From: Daniel Veillard <veillard@redhat.com>
Date: Wed, 7 Jun 2017 16:47:36 +0200
Subject: Fix NULL pointer deref in xmlDumpElementContent

Can only be triggered in recovery mode.

Fixes bug 758422 (CVE-2017-5969).
---
 valid.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/valid.c b/valid.c
index 9b2df56..8075d3a 100644
--- a/valid.c
+++ b/valid.c
@@ -1172,29 +1172,33 @@ xmlDumpElementContent(xmlBufferPtr buf, xmlElementContentPtr content, int glob)
 	    xmlBufferWriteCHAR(buf, content->name);
 	    break;
 	case XML_ELEMENT_CONTENT_SEQ:
-	    if ((content->c1->type == XML_ELEMENT_CONTENT_OR) ||
-	        (content->c1->type == XML_ELEMENT_CONTENT_SEQ))
+	    if ((content->c1 != NULL) &&
+	        ((content->c1->type == XML_ELEMENT_CONTENT_OR) ||
+	         (content->c1->type == XML_ELEMENT_CONTENT_SEQ)))
 		xmlDumpElementContent(buf, content->c1, 1);
 	    else
 		xmlDumpElementContent(buf, content->c1, 0);
             xmlBufferWriteChar(buf, " , ");
-	    if ((content->c2->type == XML_ELEMENT_CONTENT_OR) ||
-	        ((content->c2->type == XML_ELEMENT_CONTENT_SEQ) &&
-		 (content->c2->ocur != XML_ELEMENT_CONTENT_ONCE)))
+	    if ((content->c2 != NULL) &&
+	        ((content->c2->type == XML_ELEMENT_CONTENT_OR) ||
+	         ((content->c2->type == XML_ELEMENT_CONTENT_SEQ) &&
+		  (content->c2->ocur != XML_ELEMENT_CONTENT_ONCE))))
 		xmlDumpElementContent(buf, content->c2, 1);
 	    else
 		xmlDumpElementContent(buf, content->c2, 0);
 	    break;
 	case XML_ELEMENT_CONTENT_OR:
-	    if ((content->c1->type == XML_ELEMENT_CONTENT_OR) ||
-	        (content->c1->type == XML_ELEMENT_CONTENT_SEQ))
+	    if ((content->c1 != NULL) &&
+	        ((content->c1->type == XML_ELEMENT_CONTENT_OR) ||
+	         (content->c1->type == XML_ELEMENT_CONTENT_SEQ)))
 		xmlDumpElementContent(buf, content->c1, 1);
 	    else
 		xmlDumpElementContent(buf, content->c1, 0);
             xmlBufferWriteChar(buf, " | ");
-	    if ((content->c2->type == XML_ELEMENT_CONTENT_SEQ) ||
-	        ((content->c2->type == XML_ELEMENT_CONTENT_OR) &&
-		 (content->c2->ocur != XML_ELEMENT_CONTENT_ONCE)))
+	    if ((content->c2 != NULL) &&
+	        ((content->c2->type == XML_ELEMENT_CONTENT_SEQ) ||
+	         ((content->c2->type == XML_ELEMENT_CONTENT_OR) &&
+		  (content->c2->ocur != XML_ELEMENT_CONTENT_ONCE))))
 		xmlDumpElementContent(buf, content->c2, 1);
 	    else
 		xmlDumpElementContent(buf, content->c2, 0);
-- 
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File libxml2-CVE-2017-5969.patch of Package libxml2 (Revision a698e4ad231ec000622a7a7ffaf296e5)

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