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Protect against negative totalWeight values #1364

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Merged
merged 1 commit into from
Oct 30, 2018
Merged

Protect against negative totalWeight values #1364

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17 changes: 12 additions & 5 deletions vertical-pod-autoscaler/pkg/recommender/util/histogram.go
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Original file line number Diff line number Diff line change
Expand Up @@ -118,17 +118,24 @@ func (h *histogram) AddSample(value float64, weight float64, time time.Time) {
}
}

func safeSubtract(value, sub, epsilon float64) float64 {
value -= sub
if value < epsilon {
return 0.0
}
return value
}

func (h *histogram) SubtractSample(value float64, weight float64, time time.Time) {
if weight < 0.0 {
panic("sample weight must be non-negative")
}
bucket := h.options.FindBucket(value)
epsilon := h.options.Epsilon()
if weight > h.bucketWeight[bucket]-epsilon {
weight = h.bucketWeight[bucket]
}
h.totalWeight -= weight
h.bucketWeight[bucket] -= weight

h.totalWeight = safeSubtract(h.totalWeight, weight, epsilon)
h.bucketWeight[bucket] = safeSubtract(h.bucketWeight[bucket], weight, epsilon)

h.updateMinAndMaxBucket()
}

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