void kvm_arch_commit_memory_region(struct kvm *kvm,
				   const struct kvm_userspace_memory_region *mem,
				   const struct kvm_memory_slot *old,
				   const struct kvm_memory_slot *new,
				   enum kvm_mr_change change)
{
	kvmppc_core_commit_memory_region(kvm, mem, old, new);
}

The product dereferences a pointer that it expects to be valid but is NULL.