rrd: fix integer underflow
Causes a panic if last_update is smaller than RRD_DATA_ENTRIES*reso, which (I believe) can happen when inserting the first value for a DB. Clamp the value to 0 in that case. Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
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@ -60,7 +60,7 @@ impl RRA {
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let min_time = epoch - (RRD_DATA_ENTRIES as u64)*reso;
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let min_time = (min_time/reso + 1)*reso;
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let mut t = last_update - (RRD_DATA_ENTRIES as u64)*reso;
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let mut t = last_update.saturating_sub((RRD_DATA_ENTRIES as u64)*reso);
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let mut index = ((t/reso) % (RRD_DATA_ENTRIES as u64)) as usize;
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for _ in 0..RRD_DATA_ENTRIES {
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t += reso; index = (index + 1) % RRD_DATA_ENTRIES;
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