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Fix integer overflow in device_list_update.go (#1717)
Fix #1511 On 32-bits systems, int(hash.Sum32()) can be negative. This makes the computation of array indices using modulo invalid, crashing dendrite. Signed-off-by: Loïck Bonniot <git@lesterpig.com>
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@ -245,7 +245,7 @@ func (u *DeviceListUpdater) notifyWorkers(userID string) {
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}
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hash := fnv.New32a()
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_, _ = hash.Write([]byte(remoteServer))
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index := int(hash.Sum32()) % len(u.workerChans)
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index := int(int64(hash.Sum32()) % int64(len(u.workerChans)))
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ch := u.assignChannel(userID)
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u.workerChans[index] <- remoteServer
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