Bug report

Bug description:

Summary

Two leak bugs in socketmodule.c triggered when PySys_Audit raises:

1. getaddrinfo (line 6983): idna and/or pstr refs leaked when audit hook raises. ~657 objects leaked per 1000 calls.
2. sock_sendto (line 4810): pbuf Py_buffer not released when audit hook raises.

Reproducer (getaddrinfo leak)

import socket, sys

sys.addaudithook(lambda *a: (_ for _ in ()).throw(RuntimeError("audit")))
before = sys.gettotalrefcount()
for i in range(1000):
    try:
        socket.getaddrinfo("localhost", 80)
    except RuntimeError:
        pass
after = sys.gettotalrefcount()
print(f"Leaked {after - before} objects in 1000 calls")

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-146245: Fix ref/buffer leaks in socketmodule.c on audit hook failure #146247
• gh-146245: Fix reference and buffer leaks via audit hook in socket module #146248
• [3.14] gh-146245: Fix reference and buffer leaks via audit hook in socket module (GH-146248) #146274
• [3.13] gh-146245: Fix reference and buffer leaks via audit hook in socket module (GH-146248) #146275