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Fix integer overflow in device_list_update.go (#1717)

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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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Loïck Bonniot 2021-01-18 13:43:15 +01:00 committed by GitHub
parent cf82e08096
commit 940577cd3c
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1 changed files with 1 additions and 1 deletions
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keyserver/internal/device_list_update.go
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@ -245,7 +245,7 @@ func (u *DeviceListUpdater) notifyWorkers(userID string) {
} }
hash := fnv.New32a() hash := fnv.New32a()
_, _ = hash.Write([]byte(remoteServer)) _, _ = hash.Write([]byte(remoteServer))
index := int(hash.Sum32()) % len(u.workerChans) index := int(int64(hash.Sum32()) % int64(len(u.workerChans)))
ch := u.assignChannel(userID) ch := u.assignChannel(userID)
u.workerChans[index] <- remoteServer u.workerChans[index] <- remoteServer