Commit 7ec28e26 authored by Denis Efremov's avatar Denis Efremov Committed by Paolo Bonzini
Browse files

KVM: Use vmemdup_user() 



Replace opencoded alloc and copy with vmemdup_user().

Signed-off-by: default avatarDenis Efremov <efremov@linux.com>
Message-Id: <20200603101131.2107303-1-efremov@linux.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 0e96edd9

arch/x86/kvm/cpuid.c

+7 −10
Original line number Diff line number Diff line
@@ -181,18 +181,15 @@ int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, 
	r = -E2BIG;

	if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)

		goto out;

	r = -ENOMEM;

	if (cpuid->nent) {

		cpuid_entries =

			vmalloc(array_size(sizeof(struct kvm_cpuid_entry),

		cpuid_entries = vmemdup_user(entries,

					     array_size(sizeof(struct kvm_cpuid_entry),

							cpuid->nent));

		if (!cpuid_entries)

			goto out;

		r = -EFAULT;

		if (copy_from_user(cpuid_entries, entries,

				   cpuid->nent * sizeof(struct kvm_cpuid_entry)))

		if (IS_ERR(cpuid_entries)) {

			r = PTR_ERR(cpuid_entries);

			goto out;

		}

	}

	for (i = 0; i < cpuid->nent; i++) {

		vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;

		vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
@@ -211,8 +208,8 @@ int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, 
	kvm_x86_ops.cpuid_update(vcpu);

	r = kvm_update_cpuid(vcpu);



	kvfree(cpuid_entries);

out:

	vfree(cpuid_entries);

	return r;

}

virt/kvm/kvm_main.c

+8 −11
Original line number Diff line number Diff line
@@ -3746,21 +3746,18 @@ static long kvm_vm_ioctl(struct file *filp, 
		if (routing.flags)

			goto out;

		if (routing.nr) {

			r = -ENOMEM;

			entries = vmalloc(array_size(sizeof(*entries),

			urouting = argp;

			entries = vmemdup_user(urouting->entries,

					       array_size(sizeof(*entries),

							  routing.nr));

			if (!entries)

			if (IS_ERR(entries)) {

				r = PTR_ERR(entries);

				goto out;

			r = -EFAULT;

			urouting = argp;

			if (copy_from_user(entries, urouting->entries,

					   routing.nr * sizeof(*entries)))

				goto out_free_irq_routing;

			}

		}

		r = kvm_set_irq_routing(kvm, entries, routing.nr,

					routing.flags);

out_free_irq_routing:

		vfree(entries);

		kvfree(entries);

		break;

	}

#endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */

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