tools: kwboot: Fix checking image header version

Function image_version() returns unsigned value, so it can never be
negative. Explicitly check for two supported image versions: v0 and v1.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>

diff --git a/tools/kwboot.c b/tools/kwboot.c
index 1d32c1b..7feeaa4 100644 (file)
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -634,7 +634,7 @@ kwboot_img_patch_hdr(void *img, size_t size)
        }
 
        image_ver = image_version(img);
-       if (image_ver < 0) {
+       if (image_ver != 0 && image_ver != 1) {
                fprintf(stderr, "Invalid image header version\n");
                errno = EINVAL;
                goto out;