efi_loader: Exit in efi_set_bootdev() upon invalid "desc"
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: NStefan Roese <sr@denx.de> Reviewed-by: NHeinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: NAlexander Graf <agraf@suse.de>
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