KVM: arm/arm64: vgic-its: Check result of allocation before use

We miss a test against NULL after allocation.

Fixes: 6d03a68f8054 ("KVM: arm64: vgic-its: Turn device_id validation into generic ID validation")
Cc: stable@vger.kernel.org # 4.8
Reported-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index cb2d0a2..8e633bd 100644 (file)
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -821,6 +821,8 @@ static int vgic_its_alloc_collection(struct vgic_its *its,
                return E_ITS_MAPC_COLLECTION_OOR;
 
        collection = kzalloc(sizeof(*collection), GFP_KERNEL);
+       if (!collection)
+               return -ENOMEM;
 
        collection->collection_id = coll_id;
        collection->target_addr = COLLECTION_NOT_MAPPED;