From 825a2ca023202f73a09660db7a49ac1109917ce8 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
Date: Fri, 23 Jul 2021 11:14:21 +0200
Subject: [PATCH] tools: kwboot: Check for v1 header size
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Too small invalid headers may cause kwboot to crash.
Check for header size of v1 images.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Chris Packham <judge.packham@gmail.com>
Tested-by: Chris Packham <judge.packham@gmail.com>
---
 tools/kwboot.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/kwboot.c b/tools/kwboot.c
index c0ac4ce19e..1d32c1b7ad 100644
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -645,6 +645,11 @@ kwboot_img_patch_hdr(void *img, size_t size)
 	else
 		hdrsz = KWBHEADER_V1_SIZE(hdr);
 
+	if (size < hdrsz) {
+		errno = EINVAL;
+		goto out;
+	}
+
 	csum = kwboot_img_csum8(hdr, hdrsz) - hdr->checksum;
 	if (csum != hdr->checksum) {
 		errno = EINVAL;
-- 
2.39.5