[U-Boot] efi_loader: Exit in efi_set_bootdev() upon invalid "desc"

[Stefan Roese]

Hi Alex,

On 04.12.2017 09:59, Alexander Graf wrote:
>> When trying to load an image from a non-existent USB key, U-Boot v2017.11
>> crashes on my x86 platform:
>>
>> => load usb 0:1 03000000 abc
>> General Protection
>> EIP: 0010:[<7b59030d>] EFLAGS: 00010286
>> Original EIP :[<fff4330d>]
>> ...
>>
>> This used to work in v2017.09. Testing has shown, that this bug was
>> introduced with patch 95c5553e [efi_loader: refactor boot device and
>> loaded_image handling].
>>
>> This patch now checks if a valid "desc" is returned from blk_get_dev()
>> and only continues when "desc" is available. Resulting in this cmd
>> output (again):
>>
>> => load usb 0:1 03000000 abc
>> ** Bad device usb 0 **
>>
>> Signed-off-by: Stefan Roese <sr at denx.de>
>> Cc: Rob Clark <robdclark at gmail.com>
>> Cc: Heinrich Schuchardt <xypron.glpk at gmx.de>
>> Cc: Alexander Graf <agraf at suse.de>
>> Cc: Marek Vasut <marex at denx.de>
>> Cc: Bin Meng <bmeng.cn at gmail.com>
>> Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
> 
> Thanks, applied to efi-next

Thanks. Does "efi-next" mean this patch will not go into v2018.01?
As it fixes a regression, I would really like to see it included in
the release.

Thanks,
Stefan