diff --git a/fs/cbfs/cbfs.c b/fs/cbfs/cbfs.c
index 415ea28..3e905c7 100644
--- a/fs/cbfs/cbfs.c
+++ b/fs/cbfs/cbfs.c
@@ -167,6 +167,8 @@
 		}
 
 		swap_file_header(&header, file_header);
+		if (header.offset >= size)
+			return log_msg_ret("range", -E2BIG);
 		ret = fill_node(node, start, &header);
 		if (ret) {
 			priv->result = CBFS_BAD_FILE;