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

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Message-ID: <26bb42a7-d946-e52c-68e6-eaeaae325983@arm.com>
Date:   Tue, 27 Mar 2018 18:10:46 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Eric Auger <eric.auger@...hat.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

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")

Reviewed-by: Marc Zyngier <marc.zyngier@....com>

	M.
-- 
Jazz is not dead. It just smells funny...