linux-kernel - Re: [PATCH for-stable-5.4] KVM: arm/arm64: Fix KVM_VGIC_V3_ADDR_TYPE

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Date:   Mon, 21 Jun 2021 17:38:32 +0200
From:   Eric Auger <eric.auger@...hat.com>
To:     Greg KH <greg@...ah.com>
Cc:     eric.auger.pro@...il.com, stable@...r.kernel.org, maz@...nel.org,
        linux-kernel@...r.kernel.org, kvmarm@...ts.cs.columbia.edu
Subject: Re: [PATCH for-stable-5.4] KVM: arm/arm64: Fix
 KVM_VGIC_V3_ADDR_TYPE_REDIST read

Hi Greg,

On 6/21/21 5:23 PM, Greg KH wrote:
> On Mon, Jun 21, 2021 at 02:42:32PM +0200, Eric Auger wrote:
>> When reading the base address of the a REDIST region
>> through KVM_VGIC_V3_ADDR_TYPE_REDIST we expect the
>> redistributor region list to be populated with a single
>> element.
>>
>> However list_first_entry() expects the list to be non empty.
>> Instead we should use list_first_entry_or_null which effectively
>> returns NULL if the list is empty.
>>
>> Fixes: dbd9733ab674 ("KVM: arm/arm64: Replace the single rdist region by a list")
>> Cc: <Stable@...r.kernel.org> # v5.4
>> Signed-off-by: Eric Auger <eric.auger@...hat.com>
>> Reported-by: Gavin Shan <gshan@...hat.com>
>> Signed-off-by: Marc Zyngier <maz@...nel.org>
>> Link: https://lore.kernel.org/r/20210412150034.29185-1-eric.auger@redhat.com
>> ---
>>  virt/kvm/arm/vgic/vgic-kvm-device.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
> Both now queued up, thanks.
>
> Next time, give us a hint as to what the upstream commit id is, so that
> we do not have to dig it up ourselves :)
Sure I will.

Thanks!

Eric
>
> thanks,
>
> greg k-h
>