From 7b03a948856d5481bcba889755ae64ddbd2dd93a Mon Sep 17 00:00:00 2001 From: tabudz Date: Mon, 22 Dec 2025 22:11:41 +0800 Subject: [PATCH] xmlparse.c: Deny internal entities closing the doctype --- source/thirdparty/expat/lib/xmlparse.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/source/thirdparty/expat/lib/xmlparse.c b/source/thirdparty/expat/lib/xmlparse.c index c4f3ffc21..a743ed0b4 100644 --- a/source/thirdparty/expat/lib/xmlparse.c +++ b/source/thirdparty/expat/lib/xmlparse.c @@ -414,7 +414,7 @@ initializeEncoding(XML_Parser parser); static enum XML_Error doProlog(XML_Parser parser, const ENCODING *enc, const char *s, const char *end, int tok, const char *next, const char **nextPtr, - XML_Bool haveMore); + XML_Bool haveMore, XML_Bool allowClosingDoctype); static enum XML_Error processInternalEntity(XML_Parser parser, ENTITY *entity, XML_Bool betweenDecl); @@ -4241,7 +4241,7 @@ externalParEntProcessor(XML_Parser parser, parser->m_processor = prologProcessor; return doProlog(parser, parser->m_encoding, s, end, tok, next, - nextPtr, (XML_Bool)!parser->m_parsingStatus.finalBuffer); + nextPtr, (XML_Bool)!parser->m_parsingStatus.finalBuffer, XML_TRUE); } static enum XML_Error PTRCALL @@ -4291,7 +4291,7 @@ prologProcessor(XML_Parser parser, const char *next = s; int tok = XmlPrologTok(parser->m_encoding, s, end, &next); return doProlog(parser, parser->m_encoding, s, end, tok, next, - nextPtr, (XML_Bool)!parser->m_parsingStatus.finalBuffer); + nextPtr, (XML_Bool)!parser->m_parsingStatus.finalBuffer, XML_TRUE); } static enum XML_Error @@ -4302,7 +4302,8 @@ doProlog(XML_Parser parser, int tok, const char *next, const char **nextPtr, - XML_Bool haveMore) + XML_Bool haveMore, + XML_Bool allowClosingDoctype) { #ifdef XML_DTD static const XML_Char externalSubsetName[] = { ASCII_HASH , '\0' }; @@ -4481,6 +4482,11 @@ doProlog(XML_Parser parser, } break; case XML_ROLE_DOCTYPE_CLOSE: + if (allowClosingDoctype != XML_TRUE) { + /* Must not close doctype from within expanded parameter entities */ + return XML_ERROR_INVALID_TOKEN; + } + if (parser->m_doctypeName) { parser->m_startDoctypeDeclHandler(parser->m_handlerArg, parser->m_doctypeName, parser->m_doctypeSysid, parser->m_doctypePubid, 0); @@ -5418,7 +5424,7 @@ processInternalEntity(XML_Parser parser, ENTITY *entity, if (entity->is_param) { int tok = XmlPrologTok(parser->m_internalEncoding, textStart, textEnd, &next); result = doProlog(parser, parser->m_internalEncoding, textStart, textEnd, tok, - next, &next, XML_FALSE); + next, &next, XML_FALSE, XML_FALSE); } else #endif /* XML_DTD */ @@ -5465,7 +5471,7 @@ internalEntityProcessor(XML_Parser parser, if (entity->is_param) { int tok = XmlPrologTok(parser->m_internalEncoding, textStart, textEnd, &next); result = doProlog(parser, parser->m_internalEncoding, textStart, textEnd, tok, - next, &next, XML_FALSE); + next, &next, XML_FALSE, XML_TRUE); } else #endif /* XML_DTD */ @@ -5492,7 +5498,7 @@ internalEntityProcessor(XML_Parser parser, parser->m_processor = prologProcessor; tok = XmlPrologTok(parser->m_encoding, s, end, &next); return doProlog(parser, parser->m_encoding, s, end, tok, next, nextPtr, - (XML_Bool)!parser->m_parsingStatus.finalBuffer); + (XML_Bool)!parser->m_parsingStatus.finalBuffer, XML_TRUE); } else #endif /* XML_DTD */