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ipn/ipnlocal: fix nil control client panic while updating TKA head

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As part of tailnet-lock netmap processing, the LocalBackend mutex
is unlocked so we can potentially make a network call. Its possible
(during shutdown or while the control client is being reset) for
b.cc to become nil before the lock is picked up again.

Fixes: #9554
Signed-off-by: Tom DNetto <tom@tailscale.com>
This commit is contained in:
Tom DNetto 2023-11-07 12:19:43 -08:00 committed by Tom
parent 3496d62ed3
commit 11a20f371a
1 changed files with 11 additions and 7 deletions
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18
ipn/ipnlocal/local.go
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@ -1120,15 +1120,19 @@ func (b *LocalBackend) SetControlClientStatus(c controlclient.Client, st control
b.logf("[v1] TKA sync error: %v", err)
}
b.mu.Lock()
if b.tka != nil {
head, err := b.tka.authority.Head().MarshalText()
if err != nil {
b.logf("[v1] error marshalling tka head: %v", err)
// As we stepped outside of the lock, it's possible for b.cc
// to now be nil.
if b.cc != nil {
if b.tka != nil {
head, err := b.tka.authority.Head().MarshalText()
if err != nil {
b.logf("[v1] error marshalling tka head: %v", err)
} else {
b.cc.SetTKAHead(string(head))
}
} else {
b.cc.SetTKAHead(string(head))
b.cc.SetTKAHead("")
}
} else {
b.cc.SetTKAHead("")
}
if !envknob.TKASkipSignatureCheck() {