fdt: Make Node.reg fail if #address-cells or #size-cells is zero

1 files changed, 2 insertions, 0 deletions

diff --git a/src/fdt.zig b/src/fdt.zig
index 14a0e8c..d62e9fd 100644
--- a/src/fdt.zig
+++ b/src/fdt.zig
@@ -67,6 +67,8 @@ pub const Node = struct {
         const address_cells = if (address_cells_bytes) |bytes| std.mem.readInt(u32, bytes[0..4], .Big) else 2;
         const size_cells = if (size_cells_bytes) |bytes| std.mem.readInt(u32, bytes[0..4], .Big) else 1;
 
+        if (address_cells == 0 or size_cells == 0) return null;
+
         const reg_prop = self.props.get("reg") orelse return null;
         const reg_elem_len = 4 * address_cells + 4 * size_cells;