tools: kwboot: Explicitly check against size of struct main_hdr_v1
Explicitly check the image size against size of struct main_hdr_v1.
This way the check is more readable, since the `hdrsz` variable
may semantically contain another value.
Signed-off-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 4fae44c..77bf5cb 100644
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -820,14 +820,14 @@
struct main_hdr_v1 *hdr;
uint32_t srcaddr;
uint8_t csum;
- size_t hdrsz = sizeof(*hdr);
+ size_t hdrsz;
int image_ver;
int is_secure;
rc = -1;
hdr = img;
- if (*size < hdrsz) {
+ if (*size < sizeof(struct main_hdr_v1)) {
errno = EINVAL;
goto out;
}