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Fix apply na overflow #56000

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Merged
merged 4 commits into from
Nov 17, 2023
Merged

Fix apply na overflow #56000

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9e3d15f
fix groupby and apply UB
WillAyd Nov 16, 2023
01b2752
fix/skip parser overflow
WillAyd Nov 16, 2023
bc474ba
revert unneeded
WillAyd Nov 16, 2023
7152098
feedback
WillAyd Nov 17, 2023
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3 changes: 2 additions & 1 deletion pandas/core/methods/selectn.py
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Original file line number Diff line number Diff line change
Expand Up @@ -139,7 +139,8 @@ def compute(self, method: str) -> Series:

# arr passed into kth_smallest must be contiguous. We copy
# here because kth_smallest will modify its input
kth_val = libalgos.kth_smallest(arr.copy(order="C"), n - 1)
# avoid OOB access with kth_smallest_c when n <= 0
kth_val = libalgos.kth_smallest(arr.copy(order="C"), max(n - 1, 0))
(ns,) = np.nonzero(arr <= kth_val)
inds = ns[arr[ns].argsort(kind="mergesort")]

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