arm: am33xx: security: Fix size calculation on header

Fix the size calculation in the verify boot. The header size
should be subtracted from the image size, not be assigned to
the image size.

Fixes: 0830d72bb9f8 ("arm: am33xx: security: adds auth support for encrypted images")
Signed-off-by: Madan Srinivas <madans@ti.com>
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>

diff --git a/arch/arm/mach-omap2/sec-common.c b/arch/arm/mach-omap2/sec-common.c
index 2630e7d316a0d34af2368d928c7ff12e0e6ab282..674517e30bb88592881097df3132808be97b5816 100644 (file)
--- a/arch/arm/mach-omap2/sec-common.c
+++ b/arch/arm/mach-omap2/sec-common.c
@@ -130,7 +130,7 @@ int secure_boot_verify_image(void **image, size_t *size)
        *size = sig_addr - cert_addr;   /* Subtract out the signature size */
        /* Subtract header if present */
        if (strncmp((char *)sig_addr, "CERT_ISW_", 9) == 0)
-               *size = ((u32 *)*image)[HEADER_SIZE_OFFSET];
+               *size -= ((u32 *)*image)[HEADER_SIZE_OFFSET];
        cert_size = *size;
 
        /* Check if image load address is 32-bit aligned */