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Fix assertion failure without get_new_connection_id#2036

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tatsuhiro-t merged 1 commit intomainfrom
fix-assertion-failure-without-get_new_connection_id
Mar 1, 2026
Merged

Fix assertion failure without get_new_connection_id#2036
tatsuhiro-t merged 1 commit intomainfrom
fix-assertion-failure-without-get_new_connection_id

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Amends b7bfe41

@tatsuhiro-t tatsuhiro-t added this to the v1.22.0 milestone Mar 1, 2026
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Summary of Changes

Hello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an assertion failure that could occur during connection initialization in ngtcp2 when the get_new_connection_id callback was not explicitly provided, even if an alternative (get_new_connection_id2) was available. The change relaxes the assertion condition to correctly validate the presence of either of these connection ID generation callbacks, ensuring proper initialization without unnecessary failures.

Highlights

  • Assertion Logic Update: Modified an assertion in the conn_new function to allow for either get_new_connection_id2 or get_new_connection_id callback functions to be present, preventing failures when only the newer get_new_connection_id2 is used.

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Changelog
  • lib/ngtcp2_conn.c
    • Updated assertion logic for connection ID callbacks.
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  • No specific activity (comments, reviews, or progress updates) has been recorded for this pull request since its creation.
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Code Review

This pull request fixes an assertion failure by allowing either the new get_new_connection_id2 callback or the older get_new_connection_id callback to be provided. This is a valid approach for backward compatibility. I have added one comment to suggest a way to make the API contract stricter and avoid potential ambiguity if both callbacks are provided.

assert(server || callbacks->recv_retry);
assert(callbacks->rand);
assert(callbacks->get_new_connection_id);
assert(callbacks->get_new_connection_id2 || callbacks->get_new_connection_id);
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medium

To prevent ambiguity if both callbacks are set, it would be clearer to enforce that only one of them is provided. This makes the API contract stricter during the transition period.

  assert(!!callbacks->get_new_connection_id2 ^ !!callbacks->get_new_connection_id);

@tatsuhiro-t tatsuhiro-t merged commit 53db23c into main Mar 1, 2026
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@tatsuhiro-t tatsuhiro-t deleted the fix-assertion-failure-without-get_new_connection_id branch March 1, 2026 02:38
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