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Date:   Sat, 25 May 2019 10:36:08 +0800
From:   Gen Zhang <>
To:     Ard Biesheuvel <>
Cc:     Darren Hart <>,
        linux-efi <>,
        Linux Kernel Mailing List <>
Subject: Re: [PATCH v2] efi_64: Fix a missing-check bug in

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 


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