[libxml2] Detect incoherency on GROW

[Daniel Veillard <veillard src gnome org>]

commit 35bcb1d758ed70aa7b257c9c3b3ff55e54e3d0da
Author: Daniel Veillard <veillard redhat com>
Date:   Fri Nov 20 15:04:09 2015 +0800

    Detect incoherency on GROW
    
    the current pointer to the input has to be between the base and end
    if not stop everything we have an internal state error.

 parser.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/parser.c b/parser.c
index 1810f99..ab007aa 100644
--- a/parser.c
+++ b/parser.c
@@ -2075,9 +2075,16 @@ static void xmlGROW (xmlParserCtxtPtr ctxt) {
          ((ctxt->input->buf) && (ctxt->input->buf->readcallback != (xmlInputReadCallback) xmlNop)) &&
         ((ctxt->options & XML_PARSE_HUGE) == 0)) {
         xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR, "Huge input lookup");
-        ctxt->instate = XML_PARSER_EOF;
+        xmlHaltParser(ctxt);
+       return;
     }
     xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
+    if ((ctxt->input->cur > ctxt->input->end) ||
+        (ctxt->input->cur < ctxt->input->base)) {
+        xmlHaltParser(ctxt);
+        xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR, "cur index out of bound");
+       return;
+    }
     if ((ctxt->input->cur != NULL) && (*ctxt->input->cur == 0) &&
         (xmlParserInputGrow(ctxt->input, INPUT_CHUNK) <= 0))
            xmlPopInput(ctxt);