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gh-146245: Fix ref/buffer leaks in socketmodule.c on audit hook failure#146247

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kimimgo wants to merge 1 commit intopython:mainfrom
kimimgo:fix/socket-audit-leak-146245
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gh-146245: Fix ref/buffer leaks in socketmodule.c on audit hook failure#146247
kimimgo wants to merge 1 commit intopython:mainfrom
kimimgo:fix/socket-audit-leak-146245

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@kimimgo kimimgo commented Mar 21, 2026

Fixes #146245

Summary

Two leak bugs in socketmodule.c when PySys_Audit raises:

1. getaddrinfo (line 6985)

return NULL skipped cleanup of idna and pstr refs. Changed to
goto err which properly calls Py_XDECREF on both.

2. sock_sendto (line 4811)

return NULL skipped PyBuffer_Release(&pbuf). Added the release
before the return, matching the pattern used in adjacent error paths.

… failure

Fix two leak bugs in socketmodule.c when PySys_Audit raises:

1. getaddrinfo: 'return NULL' replaced with 'goto err' to ensure
   idna and pstr refs are properly released via Py_XDECREF.

2. sock_sendto: Added PyBuffer_Release(&pbuf) before 'return NULL'
   to release the Py_buffer when audit hook raises.
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socketmodule.c: Reference and buffer leaks via audit hook failures

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