Re: [PATCH for-9.2 5/9] tests/qtest/migration-test: Free QCRyptoTLSTestCertReq objects

[Fabiano Rosas <farosas@suse.de>]

Peter Maydell <peter.maydell@linaro.org> writes:

> In the migration test we create several TLS certificates with
> the TLS_* macros from crypto-tls-x509-helpers.h. These macros
> create both a QCryptoTLSCertReq object which must be deinitialized
> and also an on-disk certificate file. The migration test currently
> removes the on-disk file in test_migrate_tls_x509_finish() but
> never deinitializes the QCryptoTLSCertReq, which means that memory
> allocated as part of it is leaked:
>
> Indirect leak of 2 byte(s) in 1 object(s) allocated from:
>     #0 0x5558ba33712e in malloc (/mnt/nvmedisk/linaro/qemu-from-laptop/qemu/build/asan/tests/qtest/migration-test+0x22f12e) (BuildId: 4c8618f663e538538cad19d35233124cea161491)
>     #1 0x7f64afc131f4  (/lib/x86_64-linux-gnu/libtasn1.so.6+0x81f4) (BuildId: 2fde6ecb43c586fe4077118f771077aa1298e7ea)
>     #2 0x7f64afc18d58 in asn1_write_value (/lib/x86_64-linux-gnu/libtasn1.so.6+0xdd58) (BuildId: 2fde6ecb43c586fe4077118f771077aa1298e7ea)
>     #3 0x7f64af8fc678 in gnutls_x509_crt_set_version (/lib/x86_64-linux-gnu/libgnutls.so.30+0xe7678) (BuildId: 97b8f99f392f1fd37b969a7164bcea884e23649b)
>     #4 0x5558ba470035 in test_tls_generate_cert tests/unit/crypto-tls-x509-helpers.c:234:5
>     #5 0x5558ba464e4a in test_migrate_tls_x509_start_common tests/qtest/migration-test.c:1058:5
>     #6 0x5558ba462c8a in test_migrate_tls_x509_start_default_host tests/qtest/migration-test.c:1123:12
>     #7 0x5558ba45ab40 in test_precopy_common tests/qtest/migration-test.c:1786:21
>     #8 0x5558ba450015 in test_precopy_unix_tls_x509_default_host tests/qtest/migration-test.c:2077:5
>     #9 0x5558ba46d3c7 in migration_test_wrapper tests/qtest/migration-helpers.c:456:5
>
> (and similar reports).
>
> The only function currently provided to deinit a QCryptoTLSCertReq is
> test_tls_discard_cert(), which also removes the on-disk certificate
> file.  For the migration tests we need to retain the on-disk files
> until we've finished running the test, so the simplest fix is to
> provide a new function test_tls_deinit_cert() which does only the
> cleanup of the QCryptoTLSCertReq, and call it in the right places.
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Reviewed-by: Fabiano Rosas <farosas@suse.de>