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$NetBSD: patch-xmlreader.c,v 1.1 2015/04/24 11:32:29 spz Exp $
patch for CVE-2015-1819 Enforce the reader to run in constant memory
from https://git.gnome.org/browse/libxml2/commit/?id=213f1fe0d76d30eaed6e5853057defc43e6df2c9
part 3
--- xmlreader.c.orig 2014-10-06 12:05:09.000000000 +0000
+++ xmlreader.c
@@ -2091,6 +2091,9 @@ xmlNewTextReader(xmlParserInputBufferPtr
"xmlNewTextReader : malloc failed\n");
return(NULL);
}
+ /* no operation on a reader should require a huge buffer */
+ xmlBufSetAllocationScheme(ret->buffer,
+ XML_BUFFER_ALLOC_BOUNDED);
ret->sax = (xmlSAXHandler *) xmlMalloc(sizeof(xmlSAXHandler));
if (ret->sax == NULL) {
xmlBufFree(ret->buffer);
@@ -3616,6 +3619,7 @@ xmlTextReaderConstValue(xmlTextReaderPtr
return(((xmlNsPtr) node)->href);
case XML_ATTRIBUTE_NODE:{
xmlAttrPtr attr = (xmlAttrPtr) node;
+ const xmlChar *ret;
if ((attr->children != NULL) &&
(attr->children->type == XML_TEXT_NODE) &&
@@ -3629,10 +3633,21 @@ xmlTextReaderConstValue(xmlTextReaderPtr
"xmlTextReaderSetup : malloc failed\n");
return (NULL);
}
+ xmlBufSetAllocationScheme(reader->buffer,
+ XML_BUFFER_ALLOC_BOUNDED);
} else
xmlBufEmpty(reader->buffer);
xmlBufGetNodeContent(reader->buffer, node);
- return(xmlBufContent(reader->buffer));
+ ret = xmlBufContent(reader->buffer);
+ if (ret == NULL) {
+ /* error on the buffer best to reallocate */
+ xmlBufFree(reader->buffer);
+ reader->buffer = xmlBufCreateSize(100);
+ xmlBufSetAllocationScheme(reader->buffer,
+ XML_BUFFER_ALLOC_BOUNDED);
+ ret = BAD_CAST "";
+ }
+ return(ret);
}
break;
}
@@ -5131,6 +5146,9 @@ xmlTextReaderSetup(xmlTextReaderPtr read
"xmlTextReaderSetup : malloc failed\n");
return (-1);
}
+ /* no operation on a reader should require a huge buffer */
+ xmlBufSetAllocationScheme(reader->buffer,
+ XML_BUFFER_ALLOC_BOUNDED);
if (reader->sax == NULL)
reader->sax = (xmlSAXHandler *) xmlMalloc(sizeof(xmlSAXHandler));
if (reader->sax == NULL) {
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