commit b8e0fa3489b344d9cbd1165687e7dc5b15cc3727
author Hugh Davenport <hugh@davenport.net.nz> Wed May 04 10:55:49 2016 +0800
committer Daniel Veillard <veillard@redhat.com> Wed May 04 10:55:49 2016 +0800
tree 68c15d181eb7cbf84f79af09703d74c3906272ae
parent 90da33cebeba87ae3b49a270c8182142dd7cb48e

    Fix null pointer deref in docs with no root element

    From https://bugzilla.gnome.org/show_bug.cgi?id=758514

xmllint.c

diff --git a/xmllint.c b/xmllint.c
index 9e85c11..00f1769 100644
--- a/xmllint.c
+++ b/xmllint.c
@@ -2002,6 +2002,12 @@
     xmlNsPtr ns;
 
     root = xmlDocGetRootElement(doc);
+    if (root == NULL ) {
+        xmlGenericError(xmlGenericErrorContext,
+                "Document does not have a root element");
+        progresult = XMLLINT_ERR_UNCLASS;
+        return;
+    }
     for (ns = root->nsDef, i = 0;ns != NULL && i < 20;ns=ns->next) {
         namespaces[i++] = ns->href;
         namespaces[i++] = ns->prefix;