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bltinmodule.c: lazy_import NULL deref without Python frame #151510
Description
Crash report
What happened?
Original gist: https://gist.github.com/devdanzin/cc84f43d7a5c774b47551060c061391f. A PR is on the way.
Summary
builtin___lazy_import___impl (line 321): When globals=NULL and PyEval_GetGlobals() returns NULL (no Python frame), PyDict_Check(globals) dereferences NULL → segfault. Reachable from embedded interpreters.
Fix
Add NULL check for globals after PyEval_GetGlobals().
CPython versions tested on:
CPython main branch
Operating systems tested on:
No response
Output from running 'python -VV' on the command line:
No response
Activity
gh-151510: Fix __lazy_import__ without frame (#151511)
[3.15] gh-151510: Fix __lazy_import__ without frame (GH-151511) (#151610