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KVM: arm/arm64: vgic: Fix potential double free dist->spis in __kvm_vgic_destroy()

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[ Upstream commit 0bda9498dd45280e334bfe88b815ebf519602cc3 ]

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 <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Reviewed-by: Eric Auger <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Miaohe Lin 2019-11-28 14:38:48 +08:00 • committed by Greg Kroah-Hartman
commit 566b1bb7d3
1 changed files with 1 additions and 0 deletions
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1
virt/kvm/arm/vgic/vgic-init.c
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@ -177,6 +177,7 @@ static int kvm_vgic_dist_init(struct kvm *kvm, unsigned int nr_spis)
break;
default:
kfree(dist->spis);
dist->spis = NULL;
return -EINVAL;
}
}