[BugFix] Fix off-by-one error in the type index range check within Object::IsInstance()#17902
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tqchen merged 2 commits intoapache:mainfrom Apr 30, 2025
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@liangfu @tqchen @wweic @cbalint13 @tkonolige @FrozenGene @eqy |
tqchen
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Apr 29, 2025
…nstance() This PR fixes an off-by-one error in the type index range check within `Object::IsInstance()`. Currently, the condition `self->type_index_ < end` is used to check if a type index falls within a reserved range (`[begin, end)`). However, since end is computed as `begin + _type_child_slots`, this means the range check excludes the last valid index `(end - 1)`. Example: If `begin = 500` and `_type_child_slots = 5`, then `end = 505`. The current check (`500 <= type_index_ < 505`) only allows 500, 501, 502, ..., 504, but logically, 505 should also be included if `_type_child_slots` is meant to cover indices up to `begin + _type_child_slots`.
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@tqchen The arm/pr-head CI failed due to Jenkins agent disconnection. Could you please help trigger a rerun action? Thanks! |
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@tvm-bot rerun |
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Thanks! |
tqchen
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Apr 30, 2025
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This PR fixes an off-by-one error in the type index range check within
Object::IsInstance(), an example and steps to reproduce it are at Issue #17901.