Tom DNetto
11a20f371a
ipn/ipnlocal: fix nil control client panic while updating TKA head
...
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>
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