From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Rhodri James Date: Tue, 25 Apr 2017 16:21:27 +0100 Subject: [PATCH] Validate parser parameter to XML_UseForeignDTD. --- lib/expat.h | 5 ++++- lib/xmlparse.c | 2 ++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/lib/expat.h b/lib/expat.h index ec62f140..145c283b 100644 --- a/lib/expat.h +++ b/lib/expat.h @@ -95,7 +95,9 @@ enum XML_Error { /* Added in 2.0. */ XML_ERROR_RESERVED_PREFIX_XML, XML_ERROR_RESERVED_PREFIX_XMLNS, - XML_ERROR_RESERVED_NAMESPACE_URI + XML_ERROR_RESERVED_NAMESPACE_URI, + /* Added in 2.2 */ + XML_ERROR_INVALID_ARGUMENT }; enum XML_Content_Type { @@ -706,6 +708,7 @@ XML_UseParserAsHandlerArg(XML_Parser parser); be called, despite an external subset being parsed. Note: If XML_DTD is not defined when Expat is compiled, returns XML_ERROR_FEATURE_REQUIRES_XML_DTD. + Note: If parser == NULL, returns XML_ERROR_INVALID_ARGUMENT. */ XMLPARSEAPI(enum XML_Error) XML_UseForeignDTD(XML_Parser parser, XML_Bool useDTD); diff --git a/lib/xmlparse.c b/lib/xmlparse.c index 57c93e05..9df42782 100644 --- a/lib/xmlparse.c +++ b/lib/xmlparse.c @@ -1243,6 +1243,8 @@ XML_UseParserAsHandlerArg(XML_Parser parser) enum XML_Error XMLCALL XML_UseForeignDTD(XML_Parser parser, XML_Bool useDTD) { + if (parser == NULL) + return XML_ERROR_INVALID_ARGUMENT; #ifdef XML_DTD /* block after XML_Parse()/XML_ParseBuffer() has been called */ if (ps_parsing == XML_PARSING || ps_parsing == XML_SUSPENDED)