Re: [PATCH v2] efi_64: Fix a missing-check bug in arch/x86/platform/efi/efi_64.c

From: Gen Zhang
Date: Fri May 24 2019 - 22:39:55 EST

On Fri, May 24, 2019 at 06:07:10PM +0200, Ard Biesheuvel wrote:
> Apologies for only spotting this now, but I seem to have given some bad advice.
> efi_call_phys_prolog() in efi_64.c will also return NULL if
> (!efi_enabled(EFI_OLD_MEMMAP)), but this is not an error condition. So
> that occurrence has to be updated: please return efi_mm.pgd instead.
Thanks for your reply, Ard. You mean that we should return efi_mm.pgd
when allcoation fails? And we should delete return EFI_ABORTED on the
caller site, right? In that case, how should we handle the NULL pointer
returned by condition if(!efi_enabled(EFI_OLD_MEMMAP)) on the caller