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parser: Increase XML_MAX_DICTIONARY_LIMIT

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This limit is somewhat arbitrary and can be reached when fuzzing
documents up to 1 MB.

Increase limit to 100 MB and disable limit if XML_PARSE_HUGE is set.
This commit is contained in:
Nick Wellnhofer 2024-07-22 12:53:00 +02:00
parent d2755cdb6f
commit 6a3c0b0d93
3 changed files with 6 additions and 2 deletions
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2
include/libxml/parserInternals.h
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@ -71,7 +71,7 @@ XMLPUBVAR const unsigned int xmlParserMaxDepth;
* use XML_PARSE_HUGE option to override it.
* Introduced in 2.9.0
*/
#define XML_MAX_DICTIONARY_LIMIT 10000000
#define XML_MAX_DICTIONARY_LIMIT 100000000
/**
* XML_MAX_LOOKUP_LIMIT:

5
parser.c
View File

@ -973,6 +973,11 @@ xmlCtxtInitializeLate(xmlParserCtxtPtr ctxt) {
(ctxt->str_xml_ns == NULL)) {
xmlErrMemory(ctxt);
}
xmlDictSetLimit(ctxt->dict,
(ctxt->options & XML_PARSE_HUGE) ?
0 :
XML_MAX_DICTIONARY_LIMIT);
}
typedef struct {

1
parserInternals.c
View File

@ -2696,7 +2696,6 @@ xmlInitSAXParserCtxt(xmlParserCtxtPtr ctxt, const xmlSAXHandler *sax,
ctxt->dict = xmlDictCreate();
if (ctxt->dict == NULL)
return(-1);
xmlDictSetLimit(ctxt->dict, XML_MAX_DICTIONARY_LIMIT);
if (ctxt->sax == NULL)
ctxt->sax = (xmlSAXHandler *) xmlMalloc(sizeof(xmlSAXHandler));