Messages in this thread Patch in this message | | | From | Eric Auger <> | Subject | [PATCH v6 01/12] KVM: arm/arm64: Set dist->spis to NULL after kfree | Date | Mon, 30 Apr 2018 13:48:27 +0200 |
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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.
Fixes: ad275b8bb1e6 ("KVM: arm/arm64: vgic-new: vgic_init: implement vgic_init")
Signed-off-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@arm.com>
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v2 -> v3: - added Marc's R-b and Fixed commit --- 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 68378fe..c52f03d 100644 --- a/virt/kvm/arm/vgic/vgic-init.c +++ b/virt/kvm/arm/vgic/vgic-init.c @@ -308,6 +308,7 @@ static void kvm_vgic_dist_destroy(struct kvm *kvm) dist->initialized = false; kfree(dist->spis); + dist->spis = NULL; dist->nr_spis = 0; if (vgic_supports_direct_msis(kvm)) -- 2.5.5
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