[PATCH u-boot-marvell 11/13] tools: kwboot: Calculate real used space in kwbimage header when calling kwboot_img_grow_hdr()

[Marek Behún]

From: Pali Rohár <pali at kernel.org>

Size of the header stored in kwbimage may be larger than real used size in
the kwbimage header. If there is unused space in kwbimage header then use
it for growing it. So update code to calculate used space of kwbimage
header.

Signed-off-by: Pali Rohár <pali at kernel.org>
Reviewed-by: Marek Behún <marek.behun at nic.cz>
---
 tools/kwboot.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/tools/kwboot.c b/tools/kwboot.c
index bb7555369c..5d7cb7a774 100644
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -1318,11 +1318,20 @@ kwboot_img_grow_hdr(void *img, size_t *size, size_t grow)
 {
 	uint32_t hdrsz, datasz, srcaddr;
 	struct main_hdr_v1 *hdr = img;
+	struct opt_hdr_v1 *ohdr;
 	uint8_t *data;
 
 	srcaddr = le32_to_cpu(hdr->srcaddr);
 
-	hdrsz = kwbheader_size(img);
+	/* calculate real used space in kwbimage header */
+	if (kwbimage_version(img) == 0) {
+		hdrsz = kwbheader_size(img);
+	} else {
+		hdrsz = sizeof(*hdr);
+		for_each_opt_hdr_v1 (ohdr, hdr)
+			hdrsz += opt_hdr_v1_size(ohdr);
+	}
+
 	data = (uint8_t *)img + srcaddr;
 	datasz = *size - srcaddr;
 
@@ -1339,8 +1348,10 @@ kwboot_img_grow_hdr(void *img, size_t *size, size_t grow)
 
 	if (kwbimage_version(img) == 1) {
 		hdrsz += grow;
-		hdr->headersz_msb = hdrsz >> 16;
-		hdr->headersz_lsb = cpu_to_le16(hdrsz & 0xffff);
+		if (hdrsz > kwbheader_size(img)) {
+			hdr->headersz_msb = hdrsz >> 16;
+			hdr->headersz_lsb = cpu_to_le16(hdrsz & 0xffff);
+		}
 	}
 }
 
-- 
2.32.0