fdt: Check for a valid fdt in oftree_ensure()

Check the header before starting to use it, since this could provide
very confusing later, when ofnode calls start to fail.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index f72ea41..21a233f 100644 (file)
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -83,6 +83,11 @@ static oftree oftree_ensure(void *fdt)
                        if (check_tree_count())
                                return oftree_null();
 
+                       if (fdt_check_header(fdt)) {
+                               log_err("Invalid device tree blob header\n");
+                               return oftree_null();
+                       }
+
                        /* register the new tree */
                        i = oftree_count++;
                        oftree_list[i] = fdt;