mixclient: Avoid jitter calculation panic #3448
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davecgh
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Oct 15, 2024
rand.Duration may not be called with a negative or zero upper bound, but this was seen to occur in (*Client).prDelay(). Two notable possible bugs stood out. First, if sendBefore is exactly equal to now, then it will not be incremented by another epoch duration, leading to a potential invalid rand.Duration parameter. This is corrected by also checking for the times equaling exactly. Second, time.Until() causes an additional call to time.Now(), which we have already fetched and all calculations must be based on it. If sendBefore.Sub(now) is an extremely small value, it is possible that time.Until(sendBefore) now returns a small negative or zero duration. This is corrected by replacing the time.Until call with sendBefore.Sub(now).
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rand.Durationmay not be called with a negative or zero upper bound, but this was seen to occur in(*Client).prDelay(). Two notable possible bugs stood out.First, if
sendBeforeis exactly equal tonow, then it will not be incremented by another epoch duration, leading to a potential invalidrand.Durationparameter. This is corrected by also checking for the times equaling exactly.Second,
time.Until()causes an additional call totime.Now(), which we have already fetched and all calculations must be based on it. IfsendBefore.Sub(now)is an extremely small value, it is possible thattime.Until(sendBefore)now returns a small negative or zero duration. This is corrected by replacing thetime.Untilcall withsendBefore.Sub(now).