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37 lines
1.2 KiB
37 lines
1.2 KiB
5 years ago
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From 0f3b843b3534784ef57a4f9b874238aa1fda5a73 Mon Sep 17 00:00:00 2001
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From: Nick Wellnhofer <wellnhofer@aevum.de>
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Date: Thu, 1 Jun 2017 23:12:19 +0200
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Subject: [PATCH] Fix XPath stack frame logic
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Move the calls to xmlXPathSetFrame and xmlXPathPopFrame around in
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xmlXPathCompOpEvalPositionalPredicate to make sure that the context
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object on the stack is actually protected. Otherwise, memory corruption
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can occur when calling sloppily coded XPath extension functions.
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Fixes bug 783160.
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---
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xpath.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/xpath.c b/xpath.c
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index 94815075..b816bd36 100644
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--- a/xpath.c
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+++ b/xpath.c
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@@ -11932,11 +11932,11 @@ xmlXPathCompOpEvalPositionalPredicate(xmlXPathParserContextPtr ctxt,
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}
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}
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- frame = xmlXPathSetFrame(ctxt);
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valuePush(ctxt, contextObj);
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+ frame = xmlXPathSetFrame(ctxt);
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res = xmlXPathCompOpEvalToBoolean(ctxt, exprOp, 1);
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- tmp = valuePop(ctxt);
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xmlXPathPopFrame(ctxt, frame);
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+ tmp = valuePop(ctxt);
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if ((ctxt->error != XPATH_EXPRESSION_OK) || (res == -1)) {
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while (tmp != contextObj) {
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--
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2.22.0
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