xmlparse.c: Fix external entity infinite loop bug (CVE-2017-9233)
@@ -3981,6 +3981,14 @@ entityValueInitProcessor(XML_Parser parser,
*nextPtr = next;
return XML_ERROR_NONE;
}
+ /* If we get this token, we have the start of what might be a
+ normal tag, but not a declaration (i.e. it doesn't begin with
+ "<!"). In a DTD context, that isn't legal.
+ */
+ else if (tok == XML_TOK_INSTANCE_START) {
+ *nextPtr = next;
+ return XML_ERROR_SYNTAX;
+ }
start = next;
eventPtr = start;
}
