commit 498a54c26abd0fbd6f7d02b6b6f0275b4390d821
Author: Daniel Veillard <veillard@redhat.com>
Date:   Tue Feb 9 12:55:29 2016 +0100

    Heap-based buffer overread in xmlNextChar
    
    For https://bugzilla.gnome.org/show_bug.cgi?id=759671
    
    when the end of the internal subset isn't properly detected
    xmlParseInternalSubset should just return instead of trying
    to process input further.

diff --git a/parser.c b/parser.c
index f4fc310..b1215ca 100644
--- a/parser.c
+++ b/parser.c
@@ -8448,6 +8448,7 @@ xmlParseInternalSubset(xmlParserCtxtPtr ctxt) {
      */
     if (RAW != '>') {
 	xmlFatalErr(ctxt, XML_ERR_DOCTYPE_NOT_FINISHED, NULL);
+	return;
     }
     NEXT;
 }