[U-Boot] [PATCH v2] efi_loader: initialise partition_signature memory

[Artturi Alm <artturi.alm@gmail.com>]

On Wed, Nov 22, 2017 at 02:18:59PM +1100, Jonathan Gray wrote:
> Zero partition_signature in the efi_device_path_hard_drive_path
> structure when signature_type is 0 (no signature) as required by the
> UEFI specification.
> 
> This is required so that efi_dp_match() will work as expected
> when doing memcmp() comparisons.  Previously uninitialised memory
> would cause it not match nodes when it should have when the signature
> type was not GUID.
> 
> Corrects a problem where the loaded image protocol would not return a
> device path with MEDIA_DEVICE causing the OpenBSD bootloader to fail
> on rpi_3 and other targets.
> 
> v2: Also handle signature_type 1 (MBR) as described in the specification
> 
> Signed-off-by: Jonathan Gray <jsg@jsg.id.au>

Tested-by: Artturi Alm <artturi.alm@gmail.com>

Tested with Marsboard_A10_defconfig.
Thanks,
-Artturi

> ---
>  lib/efi_loader/efi_device_path.c | 21 +++++++++++++++++++--
>  1 file changed, 19 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
> index f6e368e029..12a81d311c 100644
> --- a/lib/efi_loader/efi_device_path.c
> +++ b/lib/efi_loader/efi_device_path.c
> @@ -427,10 +427,27 @@ static void *dp_part_fill(void *buf, struct blk_desc *desc, int part)
>  			hddp->partmap_type = 2;
>  		else
>  			hddp->partmap_type = 1;
> -		hddp->signature_type = desc->sig_type;
> -		if (hddp->signature_type != 0)
> +
> +		switch (desc->sig_type) {
> +		case SIG_TYPE_NONE:
> +		default:
> +			hddp->signature_type = 0;
> +			memset(hddp->partition_signature, 0,
> +			       sizeof(hddp->partition_signature));
> +			break;
> +		case SIG_TYPE_MBR:
> +			hddp->signature_type = 1;
> +			memset(hddp->partition_signature, 0,
> +			       sizeof(hddp->partition_signature));
> +			memcpy(hddp->partition_signature, &desc->mbr_sig,
> +			       sizeof(desc->mbr_sig));
> +			break;
> +		case SIG_TYPE_GUID:
> +			hddp->signature_type = 2;
>  			memcpy(hddp->partition_signature, &desc->guid_sig,
>  			       sizeof(hddp->partition_signature));
> +			break;
> +		}
>  
>  		buf = &hddp[1];
>  	}
> -- 
> 2.15.0
> 
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