File libxml2-2.9.4-CVE-2017-15412.patch of Package libxml2

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File libxml2-2.9.4-CVE-2017-15412.patch of Package libxml2 (Revision 4c1018f42834c4a26c10d42e449de997)

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From 0f3b843b3534784ef57a4f9b874238aa1fda5a73 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Thu, 1 Jun 2017 23:12:19 +0200
Subject: Fix XPath stack frame logic

Move the calls to xmlXPathSetFrame and xmlXPathPopFrame around in
xmlXPathCompOpEvalPositionalPredicate to make sure that the context
object on the stack is actually protected. Otherwise, memory corruption
can occur when calling sloppily coded XPath extension functions.

Fixes bug 783160.
---
 xpath.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xpath.c b/xpath.c
index 9481507..b816bd3 100644
--- a/xpath.c
+++ b/xpath.c
@@ -11932,11 +11932,11 @@ xmlXPathCompOpEvalPositionalPredicate(xmlXPathParserContextPtr ctxt,
 		}
 	    }
 
-            frame = xmlXPathSetFrame(ctxt);
 	    valuePush(ctxt, contextObj);
+            frame = xmlXPathSetFrame(ctxt);
 	    res = xmlXPathCompOpEvalToBoolean(ctxt, exprOp, 1);
-            tmp = valuePop(ctxt);
             xmlXPathPopFrame(ctxt, frame);
+            tmp = valuePop(ctxt);
 
 	    if ((ctxt->error != XPATH_EXPRESSION_OK) || (res == -1)) {
                 while (tmp != contextObj) {
-- 
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File libxml2-2.9.4-CVE-2017-15412.patch of Package libxml2 (Revision 4c1018f42834c4a26c10d42e449de997)

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