[PATCH] KVM: selftests: kvm_binary_stats_test: Fix index expressions

[PATCH] KVM: selftests: kvm_binary_stats_test: Fix index expressions

[Andrew Jones]

kvm_binary_stats_test accepts two arguments, the number of vms
and number of vcpus. If these inputs are not equal then the
test would likely crash for one reason or another due to using
miscalculated indices for the vcpus array. Fix the index
expressions by swapping the use of i and j.

Signed-off-by: Andrew Jones <drjones@redhat.com>
---

Applies to kvm/queue

 tools/testing/selftests/kvm/kvm_binary_stats_test.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/kvm/kvm_binary_stats_test.c b/tools/testing/selftests/kvm/kvm_binary_stats_test.c
index 1baabf955d63..3c2d06b61442 100644
--- a/tools/testing/selftests/kvm/kvm_binary_stats_test.c
+++ b/tools/testing/selftests/kvm/kvm_binary_stats_test.c
@@ -225,14 +225,14 @@ int main(int argc, char *argv[])
 	for (i = 0; i < max_vm; ++i) {
 		vms[i] = vm_create_barebones();
 		for (j = 0; j < max_vcpu; ++j)
-			vcpus[j * max_vcpu + i] = __vm_vcpu_add(vms[i], j);
+			vcpus[i * max_vcpu + j] = __vm_vcpu_add(vms[i], j);
 	}
 
 	/* Check stats read for every VM and VCPU */
 	for (i = 0; i < max_vm; ++i) {
 		vm_stats_test(vms[i]);
 		for (j = 0; j < max_vcpu; ++j)
-			vcpu_stats_test(vcpus[j * max_vcpu + i]);
+			vcpu_stats_test(vcpus[i * max_vcpu + j]);
 	}
 
 	for (i = 0; i < max_vm; ++i)
-- 
2.34.3

Re: [PATCH] KVM: selftests: kvm_binary_stats_test: Fix index expressions

[Sean Christopherson]

On Tue, Jun 14, 2022, Andrew Jones wrote:
> kvm_binary_stats_test accepts two arguments, the number of vms
> and number of vcpus. If these inputs are not equal then the
> test would likely crash for one reason or another due to using
> miscalculated indices for the vcpus array. Fix the index
> expressions by swapping the use of i and j.
> 
> Signed-off-by: Andrew Jones <drjones@redhat.com>
> ---

Thanks!  I had done this locally but lost track of it when updating kvm/queue.

Reviewed-by: Sean Christopherson <seanjc@google.com>