extmod/modtls_mbedtls: Do gc_collect and retry ssl_init on any error. #17750
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #17750 +/- ##
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- Coverage 98.39% 98.38% -0.01%
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Files 171 171
Lines 22257 22257
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- Hits 21899 21898 -1
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projectgus
approved these changes
Jul 30, 2025
Contrary to the docs, mbedtls can return more than just MBEDTLS_ERR_SSL_ALLOC_FAILED when `mbedtls_ssl_setup()` fails. At least MBEDTLS_ERR_MD_ALLOC_FAILED was also seen on ESP32_GENERIC, but there could possibly be other error codes. To cover all these codes, just check if `ret` is non-0, and in that case do a `gc_collect()` and retry the init. Signed-off-by: Damien George <damien@micropython.org>
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Summary
Contrary to the docs, mbedtls can return more than just MBEDTLS_ERR_SSL_ALLOC_FAILED when
mbedtls_ssl_setup()fails. At least MBEDTLS_ERR_MD_ALLOC_FAILED was also seen on ESP32_GENERIC, but there could possibly be other error codes.To cover all these codes, just check if
retis non-0, and in that case do agc_collect()and retry the init.Testing
Tested on ESP32_GENERIC with IDF 5.4.2, running
tests/extmod/tls_noleak.py. Prior to the change here that test would fail if the board was connected to WiFi. With the change here the test passes.Trade-offs and Alternatives
Could just check for the additional MBEDTLS_ERR_MD_ALLOC_FAILED code, but IMO checking for
ret != 0is more robust. The only sensible reason formbedtls_ssl_setup()to fail is an out-of-memory error.