From 03446987c5008fd1e3732b01fd63a29c7a6d9246 Mon Sep 17 00:00:00 2001 From: Heinrich Schuchardt Date: Wed, 4 Sep 2019 22:46:13 +0200 Subject: [PATCH] efi_loader: do not set invalid screen mode EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.SetMode() should return EFI_UNDEFINED if a screen mode is not available. Signed-off-by: Heinrich Schuchardt Reviewed-by: Alexander Graf --- lib/efi_loader/efi_console.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/lib/efi_loader/efi_console.c b/lib/efi_loader/efi_console.c index 5560fc8..5109017 100644 --- a/lib/efi_loader/efi_console.c +++ b/lib/efi_loader/efi_console.c @@ -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)); -- 2.7.4