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Prevent OOB error in addRoomDeltaToResponse

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This commit is contained in:
Neil Alexander 2020-01-22 18:04:58 +00:00
parent 86dc91846b
commit 6cea9e8e67
1 changed files with 5 additions and 3 deletions
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8
syncapi/storage/postgres/syncserver.go
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@ -829,9 +829,11 @@ func (d *SyncServerDatasource) addRoomDeltaToResponse(
// Retrieve the backward topology position, i.e. the position of the
// oldest event in the room's topology.
var backwardTopologyPos types.StreamPosition
backwardTopologyPos, err = d.topology.selectPositionInTopology(ctx, recentStreamEvents[0].EventID())
if err != nil {
return err
if len(recentStreamEvents) > 0 {
backwardTopologyPos, err = d.topology.selectPositionInTopology(ctx, recentStreamEvents[0].EventID())
if err != nil {
return err
}
}
if backwardTopologyPos-1 <= 0 {
backwardTopologyPos = types.StreamPosition(1)