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net/netcheck: fix race condition initializting RegionLatency maps.

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Under some conditions, code would try to look things up in the maps
before the first call to updateLatency. I don't see any reason to delay
initialization of the maps, so let's just init them right away when
creating the Report instance.

Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
This commit is contained in:
Avery Pennarun 2020-05-28 03:37:46 -04:00
parent 5eb09c8f5e
commit 7cd9ff3dde
2 changed files with 14 additions and 10 deletions
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22
net/netcheck/netcheck.go
View File

@ -518,17 +518,17 @@ func (rs *reportState) addNodeLatency(node *tailcfg.DERPNode, ipp netaddr.IPPort
ret := rs.report
ret.UDP = true
updateLatency(&ret.RegionLatency, node.RegionID, d)
updateLatency(ret.RegionLatency, node.RegionID, d)
switch {
case ipp.IP.Is6():
updateLatency(&ret.RegionV6Latency, node.RegionID, d)
updateLatency(ret.RegionV6Latency, node.RegionID, d)
ret.IPv6 = true
ret.GlobalV6 = ipPortStr
// TODO: track MappingVariesByDestIP for IPv6
// too? Would be sad if so, but who knows.
case ipp.IP.Is4():
updateLatency(&ret.RegionV4Latency, node.RegionID, d)
updateLatency(ret.RegionV4Latency, node.RegionID, d)
if rs.gotEP4 == "" {
rs.gotEP4 = ipPortStr
ret.GlobalV4 = ipPortStr
@ -543,6 +543,14 @@ func (rs *reportState) addNodeLatency(node *tailcfg.DERPNode, ipp netaddr.IPPort
}
}
func newReport() *Report {
return &Report{
RegionLatency: make(map[int]time.Duration),
RegionV4Latency: make(map[int]time.Duration),
RegionV6Latency: make(map[int]time.Duration),
}
}
// GetReport gets a report.
//
// It may not be called concurrently with itself.
@ -564,7 +572,7 @@ func (c *Client) GetReport(ctx context.Context, dm *tailcfg.DERPMap) (*Report, e
}
rs := &reportState{
c: c,
report: new(Report),
report: newReport(),
inFlight: map[stun.TxID]func(netaddr.IPPort){},
hairTX: stun.NewTxID(), // random payload
gotHairSTUN: make(chan *net.UDPAddr, 1),
@ -806,11 +814,7 @@ func (c *Client) addReportHistoryAndSetPreferredDERP(r *Report) {
}
}
func updateLatency(mp *map[int]time.Duration, regionID int, d time.Duration) {
if *mp == nil {
*mp = make(map[int]time.Duration)
}
m := *mp
func updateLatency(m map[int]time.Duration, regionID int, d time.Duration) {
if prev, ok := m[regionID]; !ok || d < prev {
m[regionID] = d
}

2
net/netcheck/netcheck_test.go
View File

@ -96,7 +96,7 @@ func TestWorksWhenUDPBlocked(t *testing.T) {
if err != nil {
t.Fatal(err)
}
want := new(Report)
want := newReport()
if !reflect.DeepEqual(r, want) {
t.Errorf("mismatch\n got: %+v\nwant: %+v\n", r, want)