device-tree: get_val cannot cope with cells > 2, add early_panic

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Tim Deegan <tim@xen.org>
Committed-by: Ian Campbell <ian.campbell@citrix.com>

diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index 8b4ef2f45c67839341dbc80b8d9ab612f6cb2d38..260c2d486248e65985cb7c37eb5f98a9dbdd608c 100644 (file)
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -84,6 +84,9 @@ static void __init get_val(const u32 **cell, u32 cells, u64 *val)
 {
     *val = 0;
 
+    if ( cells > 2 )
+        early_panic("dtb value contains > 2 cells\n");
+
     while ( cells-- )
     {
         *val <<= 32;