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Fix NULL deref in xmlParseExternalEntityPrivate

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If called from xmlParseExternalEntity, oldctxt is NULL which leads to
a NULL deref if an error occurs. This only affects external code that
calls xmlParseExternalEntity.

Patch from David Kilzer with minor changes.

Fixes bug 780159.
This commit is contained in:
Nick Wellnhofer 2017-06-20 16:13:57 +02:00
parent 872fea9485
commit 3eef3f39a6
1 changed files with 1 additions and 1 deletions
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2
parser.c
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@ -13224,7 +13224,7 @@ xmlParseExternalEntityPrivate(xmlDocPtr doc, xmlParserCtxtPtr oldctxt,
/*
* And record the last error if any
*/
if (ctxt->lastError.code != XML_ERR_OK)
if ((oldctxt != NULL) && (ctxt->lastError.code != XML_ERR_OK))
xmlCopyError(&ctxt->lastError, &oldctxt->lastError);
if (sax != NULL)