From b07b62ee3342db3af74a8bd056dce810764cc7f1 Mon Sep 17 00:00:00 2001
From: Rob Herring <robh@kernel.org>
Date: Tue, 6 Apr 2021 14:07:12 -0500
Subject: [PATCH] libfdt: Add FDT alignment check to fdt_check_header()

Only checking the FDT alignment in fdt_ro_probe_() means that
fdt_check_header() can pass, but then subsequent API calls fail on
alignment checks. Let's add an alignment check to fdt_check_header() so
alignment errors are found up front.

Cc: Tom Rini <trini@konsulko.com>
Cc: Frank Rowand <frowand.list@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Message-Id: <20210406190712.2118098-1-robh@kernel.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 libfdt/fdt.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libfdt/fdt.c b/libfdt/fdt.c
index 3e89307..9fe7cf4 100644
--- a/libfdt/fdt.c
+++ b/libfdt/fdt.c
@@ -90,6 +90,10 @@ int fdt_check_header(const void *fdt)
 {
 	size_t hdrsize;
 
+	/* The device tree must be at an 8-byte aligned address */
+	if ((uintptr_t)fdt & 7)
+		return -FDT_ERR_ALIGNMENT;
+
 	if (fdt_magic(fdt) != FDT_MAGIC)
 		return -FDT_ERR_BADMAGIC;
 	if (!can_assume(LATEST)) {