[PATCH] fastboot: fix CRC32 chunk size checking

[Mattijs Korpershoek]

Hi Wojciech,

Thank you for your patch.

On lun., sept. 25, 2023 at 12:37, Wojciech Nizinski <niziak at spox.org> wrote:

> genimage create android-sparse file with CRC32 chunk at end. When
> U-Boot's fastboot receives this chunk it returns error message:
> `Fail Bogus chunk size for chunk type Dont Care`

I could not reproduce this, probably because my sparse images don't have
crc32 chunks.

>
> According to reference implementation of Android's sparse file format:
>
> <https://android.googlesource.com/platform/system/core/+/refs/heads/main/
> libsparse/output_file.cpp#513>
>
> the chunk_header.total_sz is CHUNK_HEADER_LEN + 4 (CRC32 size).
>
> Signed-off-by: Wojciech Nizinski <niziak at spox.org>

However, the change looks fine to me.

Reviewed-by: Mattijs Korpershoek <mkorpershoek at baylibre.com>

I also tested by reflashing a super image from aosp/main on the vim3 board.
Base commit: 2173c4a99066 ("Merge tag 'u-boot-at91-fixes-2023.10-b' of https://source.denx.de/u-boot/custodians/u-boot-at91")

Tested-by: Mattijs Korpershoek <mkorpershoek at baylibre.com> # on vim3

> ---
>
>  lib/image-sparse.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/lib/image-sparse.c b/lib/image-sparse.c
> index 8f8a67e158..323aad981c 100644
> --- a/lib/image-sparse.c
> +++ b/lib/image-sparse.c
> @@ -289,8 +289,8 @@ int write_sparse_image(struct sparse_storage *info,
>  
>  		case CHUNK_TYPE_CRC32:
>  			if (chunk_header->total_sz !=
> -			    sparse_header->chunk_hdr_sz) {
> -				info->mssg("Bogus chunk size for chunk type Dont Care",
> +			    sparse_header->chunk_hdr_sz + sizeof(uint32_t)) {
> +				info->mssg("Bogus chunk size for chunk type CRC32",
>  					   response);
>  				return -1;
>  			}
> -- 
> 2.39.2