Up to now we did not check the return value of DisconnectController. A previous patch is fixing that taking into account what happened during the controller disconnect. But that check takes place before our code is trying to figure out if the interface exists to begin with. In case a driver is not allowed to unbind -- e.g returning EFI_DEVICE_ERROR, we will end up returning that error instead of EFI_NOT_FOUND.
Add an extra check on the top of the function to make sure the protocol interface exists before trying to disconnect any drivers
Reviewed-by: Heinrich Schuchardt xypron.glpk@gmx.de Signed-off-by: Ilias Apalodimas ilias.apalodimas@linaro.org --- lib/efi_loader/efi_boottime.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c index bfcd913dfad9..d75a3336e3f1 100644 --- a/lib/efi_loader/efi_boottime.c +++ b/lib/efi_loader/efi_boottime.c @@ -1373,6 +1373,8 @@ static efi_status_t efi_uninstall_protocol r = efi_search_protocol(handle, protocol, &handler); if (r != EFI_SUCCESS) goto out; + if (handler->protocol_interface != protocol_interface) + return EFI_NOT_FOUND; /* Disconnect controllers */ r = efi_disconnect_all_drivers(efiobj, protocol, NULL); if (r != EFI_SUCCESS) { -- 2.40.1