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gh-159739: Account for NUL terminators in fallback getnameinfo - #159991
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JelleZijlstra merged 1 commit intoOct 21, 2026
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Backport to 3.15 and 3.14.
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Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14, 3.15. |
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GH-160091 is a backport of this pull request to the 3.15 branch. |
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GH-160092 is a backport of this pull request to the 3.14 branch. |
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…GH-159991) (#160092) (cherry picked from commit 69160f2) Co-authored-by: Jelle Zijlstra <jelle@openai.com>
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…GH-159991) (#160091) (cherry picked from commit 69160f2) Co-authored-by: Jelle Zijlstra <jelle@openai.com>
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Account for NUL terminators in fallback getnameinfo. On systems without a native
getnameinfo(), the fallback checks whether a host or service string fits but does not reserve space for the terminating NUL written bystrcpy. If the string length exactly equals the output buffer capacity, the terminator is written one byte past the end, potentially corrupting adjacent memory. Reject equal lengths as well as longer strings.Backport to 3.15 and 3.14.