[jelle-openai]

Do not release the borrowed skip_file_prefixes argument, and stop if
allocation of the fallback filename fails.

Backport to 3.15 and 3.14.

• Issue: Fix minor safety issues #159739

[JelleZijlstra]

Verified this crash:

>>> class X(tuple): pass
... 
>>> warnings.warn("hi", skip_file_prefixes=X())
<python-input-11>:1: UserWarning: hi
Assertion failed: (!_Py_IsStaticImmortal(op)), function Py_DECREF_MORTAL, file pycore_object.h, line 412.
Abort trap: 6

[gpshead]

consider a regression test?

class T(tuple): pass
for _ in range(3):
    with self.module.catch_warnings(record=True):
        self.module.warn("msg", skip_file_prefixes=T())

[miss-islington-app]

Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14, 3.15.
🐍🍒⛏🤖

[miss-islington-app]

Sorry, @jelle-openai and @JelleZijlstra, I could not cleanly backport this to 3.14 due to a conflict.

Please backport manually with cherry_picker, see the devguide for more information.

cherry_picker fab1405da8c93429ab1a1d3d3e1779d15b7223a2 3.14

[bedevere-app]

GH-160022 is a backport of this pull request to the 3.15 branch.

[bedevere-app]

GH-160085 is a backport of this pull request to the 3.14 branch.