hashtable iterator safety: invalidate on exhaustion#3551
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JimB123
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Apr 23, 2026
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| /* Cleanup is a no-op but must not crash. */ | ||
| hashtableCleanupIterator(&iter); | ||
| hashtableRelease(ht); |
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If we don't have this covered somewhere else, it might be interesting for one of these tests to call hashtableRelease before calling hashtableCleanupIterator
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We do have one like this that tests safe iterator tracking, and I added one that specifically exhausts the iterator first.
Signed-off-by: Rain Valentine <rsg000@gmail.com>
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## unstable #3551 +/- ##
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- Coverage 76.34% 76.22% -0.12%
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Files 159 159
Lines 80045 80091 +46
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- Hits 61107 61052 -55
- Misses 18938 19039 +101
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@JimB123 we normally use squash merge |
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PR #2611 is abandoned, so I'm raising this PR to guard against the same potential issue.
If anyone called hashtableNext after it has returned false, it may re-enter the loop with stale table/index values. If the hashtable has been resized/rehashed since the first exhaustion so this may result in out of bounds access.
It also somewhat guards against the caller forgetting to clean up the iterator and leaving rehash disabled indefinitely resulting in accumulating performance degradation, but of course relying on this to automatically clean up should be avoided.