linux-kernel - Re: [PATCH] arm64: hibernate: check pgd table allocation

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Message-ID: <8ebe7877-93d3-dfd0-8ea3-2a4815b4f154@arm.com>
Date:   Mon, 14 Oct 2019 18:58:09 +0100
From:   James Morse <james.morse@....com>
To:     Pavel Tatashin <pasha.tatashin@...een.com>
Cc:     jmorris@...ei.org, sashal@...nel.org, linux-kernel@...r.kernel.org,
        catalin.marinas@....com, will@...nel.org, steve.capper@....com,
        linux-arm-kernel@...ts.infradead.org, marc.zyngier@....com,
        vladimir.murzin@....com, mark.rutland@....com, tglx@...utronix.de
Subject: Re: [PATCH] arm64: hibernate: check pgd table allocation

Hi Pavel,

On 14/10/2019 15:48, Pavel Tatashin wrote:
> There is a bug in create_safe_exec_page(), when page table is allocated
> it is not checked that table is allocated successfully:
> 
> But it is dereferenced in: pgd_none(READ_ONCE(*pgdp)).  Check that
> allocation was successful.
> 
> Fixes: 82869ac57b5d ("arm64: kernel: Add support for hibernate/suspend-to-disk")
> 
> Signed-off-by: Pavel Tatashin <pasha.tatashin@...een.com>
> ---

Reviewed-by: James Morse <james.morse@....com>


Thanks,

James