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cmd/tailscale/cli: fix panic in netcheck with mismatched DERP region IDs

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Fixes #17564

Signed-off-by: Xinyu Kuo <gxylong@126.com>
This commit is contained in:
Xinyu Kuo
2025-10-17 13:47:13 +08:00
committed by Brad Fitzpatrick
parent e1f0ad7a05
commit 8444659ed8
1 changed files with 5 additions and 1 deletions
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6
cmd/tailscale/cli/netcheck.go
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@@ -180,7 +180,11 @@ func printReport(dm *tailcfg.DERPMap, report *netcheck.Report) error {
printf("\t* Nearest DERP: unknown (no response to latency probes)\n")
} else {
if report.PreferredDERP != 0 {
printf("\t* Nearest DERP: %v\n", dm.Regions[report.PreferredDERP].RegionName)
if region, ok := dm.Regions[report.PreferredDERP]; ok {
printf("\t* Nearest DERP: %v\n", region.RegionName)
} else {
printf("\t* Nearest DERP: %v (region not found in map)\n", report.PreferredDERP)
}
} else {
printf("\t* Nearest DERP: [none]\n")
}