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Shivay-98
6586288a41
The fix and approach are from #64491 by Shivay-98; this reopens it to get it landed, since the original stalled awaiting requested changes. `Socket.prototype._unrefTimer` and `Socket.prototype._destroy` both walk the `_parent` chain with a strict `!== null` check. During connection teardown a socket's `_parent` can be left `undefined` (for example a TLS socket layered over another stream), so the loop steps onto `undefined` and reads a property off it, throwing a TypeError: Cannot read properties of undefined (reading 'Symbol(timeout)') from an uncaught I/O callback and crashing the process. Using a nullish (`!= null`) check terminates the walk on both `null` and `undefined`. [petter@hightouch.io: apply the same fix to the identical loop in `_destroy`, which the original regression test already exercised via `destroy()`; add direct unit coverage for both paths.] Fixes: https://github.com/nodejs/node/issues/64490 Refs: https://github.com/nodejs/node/pull/64491 Signed-off-by: Petter Häggholm <petter@hightouch.io> PR-URL: https://github.com/nodejs/node/pull/64644 Fixes: https://github.com/nodejs/node/issues/64490 Refs: https://github.com/nodejs/node/pull/64491 Reviewed-By: Tim Perry <pimterry@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Ethan Arrowood <ethan@arrowood.dev> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>