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efi_loader: do not set invalid screen mode

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EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.SetMode() should return EFI_UNDEFINED if a
screen mode is not available.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Alexander Graf <agraf@csgraf.de>
This commit is contained in:
Heinrich Schuchardt 2019-09-04 22:46:13 +02:00
parent 97ea0690f4
commit 03446987c5
1 changed files with 4 additions and 0 deletions
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4
lib/efi_loader/efi_console.c
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@ -379,6 +379,10 @@ static efi_status_t EFIAPI efi_cout_set_mode(
if (mode_number >= efi_con_mode.max_mode)
return EFI_EXIT(EFI_UNSUPPORTED);
if (!efi_cout_modes[mode_number].present)
return EFI_EXIT(EFI_UNSUPPORTED);
efi_con_mode.mode = mode_number;
EFI_CALL(efi_cout_clear_screen(this));