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SubjectRe: [PATCH] KVM: vgic: Fix potential double free dist->spis in kvm vgic destroy()
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On 2019-11-28 06:38, linmiaohe wrote:
> From: Miaohe Lin <linmiaohe@huawei.com>
>
> In kvm_vgic_dist_init() called from kvm_vgic_map_resources(), if
> dist->vgic_model is invalid, dist->spis will be freed without set
> dist->spis = NULL. And in vgicv2 resources clean up path,
> __kvm_vgic_destroy() will be called to free allocated resources.
> And dist->spis will be freed again in clean up chain because we
> forget to set dist->spis = NULL in kvm_vgic_dist_init() failed
> path. So double free would happen.
>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
> virt/kvm/arm/vgic/vgic-init.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/virt/kvm/arm/vgic/vgic-init.c
> b/virt/kvm/arm/vgic/vgic-init.c
> index 53e3969dfb52..c17c29beeb72 100644
> --- a/virt/kvm/arm/vgic/vgic-init.c
> +++ b/virt/kvm/arm/vgic/vgic-init.c
> @@ -171,6 +171,7 @@ static int kvm_vgic_dist_init(struct kvm *kvm,
> unsigned int nr_spis)
> break;
> default:
> kfree(dist->spis);
> + dist->spis = NULL;
> return -EINVAL;
> }
> }

Applied, thanks.

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

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