Re: [PATCH v2] selftest: tpm2: Add Client.__del__() to close /dev/tpm* handle

[Jarkko Sakkinen <jarkko@kernel.org>]

On Tue, Sep 20, 2022 at 09:15:18AM -0400, Stefan Berger wrote:
> The following output can bee seen when the test is executed:
> 
>   test_flush_context (tpm2_tests.SpaceTest) ... \
>     /usr/lib64/python3.6/unittest/case.py:605: ResourceWarning: \
>     unclosed file <_io.FileIO name='/dev/tpmrm0' mode='rb+' closefd=True>
> 
> An instance of Client does not implicitly close /dev/tpm* handle, once it
> gets destroyed. Close the file handle in the class destructor
> Client.__del__().
> 
> Fixes: 6ea3dfe1e0732 ("selftests: add TPM 2.0 tests")
> Cc: Shuah Khan <shuah@kernel.org>
> Cc: linux-kselftest@vger.kernel.org
> Cc: Jarkko Sakkinen <jarkko@kernel.org>
> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> 
> ---
>  tools/testing/selftests/tpm2/tpm2.py | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/tools/testing/selftests/tpm2/tpm2.py b/tools/testing/selftests/tpm2/tpm2.py
> index 057a4f49c79d..c7363c6764fc 100644
> --- a/tools/testing/selftests/tpm2/tpm2.py
> +++ b/tools/testing/selftests/tpm2/tpm2.py
> @@ -371,6 +371,10 @@ class Client:
>              fcntl.fcntl(self.tpm, fcntl.F_SETFL, flags)
>              self.tpm_poll = select.poll()
>  
> +    def __del__(self):
> +        if self.tpm:
> +            self.tpm.close()
> +
>      def close(self):
>          self.tpm.close()
>  
> -- 
> 2.36.1
> 


Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>

BR, Jarkko