fixed an uninitialized memory access pointed by valgrind on C14Ntests

* SAX.c: fixed an uninitialized memory access pointed by valgrind
  on C14Ntests
Daniel

1 files changed, 4 insertions, 2 deletions

diff --git a/SAX.c b/SAX.c
index 1b3f1f50..f79a99e3 100644
--- a/SAX.c
+++ b/SAX.c
@@ -247,8 +247,10 @@ externalSubset(void *ctx, const xmlChar *name,
 	/*
 	 * On the fly encoding conversion if needed
 	 */
-	enc = xmlDetectCharEncoding(ctxt->input->cur, 4);
-	xmlSwitchEncoding(ctxt, enc);
+	if (ctxt->input->length >= 4) {
+	    enc = xmlDetectCharEncoding(ctxt->input->cur, 4);
+	    xmlSwitchEncoding(ctxt, enc);
+	}
 
 	if (input->filename == NULL)
 	    input->filename = (char *) xmlStrdup(SystemID);