tools: kwboot: Do not modify kwbimage header before increasing its size

This ensures that kwboot_img_grow_hdr() function still sees valid kwbimage
header.

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 adec4ec..bb75553 100644 (file)
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -1352,17 +1352,18 @@ kwboot_add_bin_ohdr_v1(void *img, size_t *size, uint32_t binsz)
        uint32_t num_args;
        uint32_t offset;
        uint32_t ohdrsz;
+       uint8_t *prev_ext;
 
        if (hdr->ext & 0x1) {
                for_each_opt_hdr_v1 (ohdr, img)
                        if (opt_hdr_v1_next(ohdr) == NULL)
                                break;
 
-               *opt_hdr_v1_ext(ohdr) |= 1;
-               ohdr = opt_hdr_v1_next(ohdr);
+               prev_ext = opt_hdr_v1_ext(ohdr);
+               ohdr = _opt_hdr_v1_next(ohdr);
        } else {
-               hdr->ext |= 1;
                ohdr = (void *)(hdr + 1);
+               prev_ext = &hdr->ext;
        }
 
        /*
@@ -1377,6 +1378,8 @@ kwboot_add_bin_ohdr_v1(void *img, size_t *size, uint32_t binsz)
        ohdrsz = sizeof(*ohdr) + 4 + 4 * num_args + binsz + 4;
        kwboot_img_grow_hdr(hdr, size, ohdrsz);
 
+       *prev_ext |= 1;
+
        ohdr->headertype = OPT_HDR_V1_BINARY_TYPE;
        ohdr->headersz_msb = ohdrsz >> 16;
        ohdr->headersz_lsb = cpu_to_le16(ohdrsz & 0xffff);