From: Miaohe Lin linmiaohe@huawei.com
[ 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 linmiaohe@huawei.com Signed-off-by: Marc Zyngier maz@kernel.org Reviewed-by: Eric Auger eric.auger@redhat.com Link: https://lore.kernel.org/r/1574923128-19956-1-git-send-email-linmiaohe@huawei... Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@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 cd991396dd78..1f39c61428f9 100644 --- a/virt/kvm/arm/vgic/vgic-init.c +++ b/virt/kvm/arm/vgic/vgic-init.c @@ -194,6 +194,7 @@ static int kvm_vgic_dist_init(struct kvm *kvm, unsigned int nr_spis) break; default: kfree(dist->spis); + dist->spis = NULL; return -EINVAL; } }