[PATCH 02/11] boot: bootm: derive the header probe size

[Daniel Golle]

boot_get_kernel() maps a bare 64 bytes to identify the image format.
genimg_get_format() reads at most a 40-byte FDT header or an 8-byte
Android magic, but the legacy branch that follows verifies the whole
64-byte legacy header, so that is the size the mapping has to cover.

Say so with sizeof(struct legacy_img_hdr).

Signed-off-by: Daniel Golle <daniel at makrotopia.org>
---
 boot/bootm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/boot/bootm.c b/boot/bootm.c
index 92c8452a5d3..b9aa83c3328 100644
--- a/boot/bootm.c
+++ b/boot/bootm.c
@@ -158,7 +158,8 @@ static int boot_get_kernel(const char *addr_fit, struct bootm_headers *images,
 		 * parsed any #config / :subimage suffix so the FIT
 		 * selection variables are populated.
 		 */
-		buf = imagemap_map(images->imagemap, 0, 64);
+		buf = imagemap_map(images->imagemap, 0,
+				   sizeof(struct legacy_img_hdr));
 		if (IS_ERR(buf)) {
 			puts("Cannot read image header from storage\n");
 			return PTR_ERR(buf);
-- 
2.56.0