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Title: bpo-36027: Fix a potential refcount bug in long_pow by mdickinson · Pull Request #26690 · python/cpython · GitHub

Open Graph Title: bpo-36027: Fix a potential refcount bug in long_pow by mdickinson · Pull Request #26690 · python/cpython

X Title: bpo-36027: Fix a potential refcount bug in long_pow by mdickinson · Pull Request #26690 · python/cpython

Description: This PR fixes a reference counting bug introduced in #13266 and identified by @tim-one in #26662: if we don't set temp to NULL, and if the value it has at this point is retained until the end of the function, then we end up doing an extra decref. I spent some time trying to identify a test-case that exercises this bug, and failed - I couldn't find a code path where temp isn't re-used at some point. Nevertheless, it's a potential point of fragility for maintenance of this code. https://bugs.python.org/issue36027

Open Graph Description: This PR fixes a reference counting bug introduced in #13266 and identified by @tim-one in #26662: if we don't set temp to NULL, and if the value it has at this point is retained until the end o...

X Description: This PR fixes a reference counting bug introduced in #13266 and identified by @tim-one in #26662: if we don't set temp to NULL, and if the value it has at this point is retained until the e...

Opengraph URL: https://github.com/python/cpython/pull/26690

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412f432 Fix a potential reference-counting bug in long_pow mdickinson Jun 12, 2021 https://github.com/python/cpython/pull/26690/commits/412f432613850b400ae4a22eda7c12f06fe47705
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