linux-kernel - Re: [RFC v2 01/12] KVM: arm/arm64: Set dist->spis to NULL after kfree

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Date:   Wed, 28 Mar 2018 08:41:26 +0200
From:   Auger Eric <eric.auger@...hat.com>
To:     Marc Zyngier <marc.zyngier@....com>, eric.auger.pro@...il.com,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        kvmarm@...ts.cs.columbia.edu, cdall@...nel.org,
        peter.maydell@...aro.org
Cc:     andre.przywara@....com, drjones@...hat.com, wei@...hat.com
Subject: Re: [RFC v2 01/12] KVM: arm/arm64: Set dist->spis to NULL after kfree

Hi Marc,
On 27/03/18 19:10, Marc Zyngier wrote:
> On 27/03/18 15:04, Eric Auger wrote:
>> in case kvm_vgic_map_resources() fails, typically if the vgic
>> distributor is not defined, __kvm_vgic_destroy will be called
>> several times. Indeed kvm_vgic_map_resources() is called on
>> first vcpu run. As a result dist->spis is freeed more than once
>> and on the second time it causes a "kernel BUG at mm/slub.c:3912!"
>>
>> Set dist->spis to NULL to avoid the crash.
>>
>> Signed-off-by: Eric Auger <eric.auger@...hat.com>
> 
> Fixes: ad275b8bb1e6 ("KVM: arm/arm64: vgic-new: vgic_init: implement
> vgic_init")
Sorry for the oversight :-(
> 
> Reviewed-by: Marc Zyngier <marc.zyngier@....com>
Thanks

Eric
> 
> 	M.
>