netdev - Re: [PATCH net-next] NFC: nci: Extend virtual NCI deinit test

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Date:   Thu, 17 Nov 2022 13:47:18 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>, bongsu.jeon@...sung.com,
        krzysztof.kozlowski@...aro.org, netdev@...r.kernel.org
Cc:     syzkaller@...glegroups.com, Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next] NFC: nci: Extend virtual NCI deinit test

On Tue, 2022-11-15 at 10:59 +0100, Dmitry Vyukov wrote:
> Extend the test to check the scenario when NCI core tries to send data
> to already closed device to ensure that nothing bad happens.
> 
> Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: Bongsu Jeon <bongsu.jeon@...sung.com>
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: netdev@...r.kernel.org
> ---
>  tools/testing/selftests/nci/nci_dev.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/tools/testing/selftests/nci/nci_dev.c b/tools/testing/selftests/nci/nci_dev.c
> index 162c41e9bcae8..272958a4ad102 100644
> --- a/tools/testing/selftests/nci/nci_dev.c
> +++ b/tools/testing/selftests/nci/nci_dev.c
> @@ -888,6 +888,16 @@ TEST_F(NCI, deinit)
>  			   &msg);
>  	ASSERT_EQ(rc, 0);
>  	EXPECT_EQ(get_dev_enable_state(&msg), 0);
> +
> +	// Test that operations that normally send packets to the driver
> +	// don't cause issues when the device is already closed.
> +	// Note: the send of NFC_CMD_DEV_UP itself still succeeds it's just
> +	// that the device won't actually be up.
> +	close(self->virtual_nci_fd);
> +	self->virtual_nci_fd = -1;

I think you need to handle correctly negative value of virtual_nci_fd
in FIXTURE_TEARDOWN(NCI), otherwise it should trigger an assert on
pthread_join() - read() operation will fail in virtual_deinit*()

Cheers,

Paolo