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ipn/ipnlocal: fix nil pointer dereference and add related test

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Fixes #12644

Change-Id: I3589b01a9c671937192caaedbb1312fd906ca712
Signed-off-by: Adrian Dewhurst <adrian@tailscale.com>
This commit is contained in:
Adrian Dewhurst 2024-06-27 14:09:55 -04:00 committed by Adrian Dewhurst
parent 0bb82561ba
commit 8f7588900a
2 changed files with 25 additions and 1 deletions
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2
ipn/ipnlocal/local.go
View File

@ -6578,7 +6578,7 @@ func fillAllowedSuggestions() set.Set[tailcfg.StableNodeID] {
} }
func suggestExitNode(report *netcheck.Report, netMap *netmap.NetworkMap, prevSuggestion tailcfg.StableNodeID, selectRegion selectRegionFunc, selectNode selectNodeFunc, allowList set.Set[tailcfg.StableNodeID]) (res apitype.ExitNodeSuggestionResponse, err error) { func suggestExitNode(report *netcheck.Report, netMap *netmap.NetworkMap, prevSuggestion tailcfg.StableNodeID, selectRegion selectRegionFunc, selectNode selectNodeFunc, allowList set.Set[tailcfg.StableNodeID]) (res apitype.ExitNodeSuggestionResponse, err error) {
if report.PreferredDERP == 0 || netMap == nil || netMap.DERPMap == nil { if report == nil || report.PreferredDERP == 0 || netMap == nil || netMap.DERPMap == nil {
return res, ErrNoPreferredDERP return res, ErrNoPreferredDERP
} }
candidates := make([]tailcfg.NodeView, 0, len(netMap.Peers)) candidates := make([]tailcfg.NodeView, 0, len(netMap.Peers))

24
ipn/ipnlocal/local_test.go
View File

@ -3118,6 +3118,12 @@ func TestSuggestExitNode(t *testing.T) {
DERPMap: defaultDERPMap, DERPMap: defaultDERPMap,
}, },
}, },
{
name: "nil report",
lastReport: nil,
netMap: largeNetmap,
wantError: ErrNoPreferredDERP,
},
{ {
name: "no preferred derp region", name: "no preferred derp region",
lastReport: preferredNoneReport, lastReport: preferredNoneReport,
@ -3127,6 +3133,24 @@ func TestSuggestExitNode(t *testing.T) {
}, },
wantError: ErrNoPreferredDERP, wantError: ErrNoPreferredDERP,
}, },
{
name: "nil netmap",
lastReport: noLatency1Report,
netMap: nil,
wantError: ErrNoPreferredDERP,
},
{
name: "nil derpmap",
lastReport: noLatency1Report,
netMap: &netmap.NetworkMap{
SelfNode: selfNode.View(),
DERPMap: nil,
Peers: []tailcfg.NodeView{
dallasPeer5,
},
},
wantError: ErrNoPreferredDERP,
},
{ {
name: "missing suggestion capability", name: "missing suggestion capability",
lastReport: noLatency1Report, lastReport: noLatency1Report,