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James Tucker 9ed3a061c3 net/netns: fix segv when no tailscale interface is found ... `interfaces.Tailscale()` returns all zero values when it finds no Tailscale interface and encounters no errors. The netns package was treating no error as a signal that it would receive a non-zero pointer value leading to nil pointer dereference. Observed in: ``` --- FAIL: TestGetInterfaceIndex (0.00s) --- FAIL: TestGetInterfaceIndex/IP_and_port (0.00s) panic: runtime error: invalid memory address or nil pointer dereference [recovered] panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x1029eb7d8] goroutine 7 [running]: testing.tRunner.func1.2({0x102a691e0, 0x102bc05c0}) /Users/raggi/.cache/tailscale-go/src/testing/testing.go:1526 +0x1c8 testing.tRunner.func1() /Users/raggi/.cache/tailscale-go/src/testing/testing.go:1529 +0x384 panic({0x102a691e0, 0x102bc05c0}) /Users/raggi/.cache/tailscale-go/src/runtime/panic.go:884 +0x204 tailscale.com/net/netns.getInterfaceIndex(0x14000073f28, 0x1028d0284?, {0x1029ef3b7, 0xa}) /Users/raggi/src/github.com/tailscale/tailscale/net/netns/netns_darwin.go:114 +0x228 tailscale.com/net/netns.TestGetInterfaceIndex.func2(0x14000138000) /Users/raggi/src/github.com/tailscale/tailscale/net/netns/netns_darwin_test.go:37 +0x54 testing.tRunner(0x14000138000, 0x140000551b0) /Users/raggi/.cache/tailscale-go/src/testing/testing.go:1576 +0x10c created by testing.(*T).Run /Users/raggi/.cache/tailscale-go/src/testing/testing.go:1629 +0x368 FAIL tailscale.com/net/netns 0.824s ``` Fixes #8064 Signed-off-by: James Tucker <jftucker@gmail.com>		2 years ago
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art	…
connstats	…
dns	all: avoid repeated default interface lookups	2 years ago
dnscache	all: avoid repeated default interface lookups	2 years ago
dnsfallback	all: avoid repeated default interface lookups	2 years ago
flowtrack	…
interfaces	…
memnet	…
netaddr	…
netcheck	net/ping,netcheck: add v6 pinging capabilities to pinger (#7971)	2 years ago
neterror	…
netknob	…
netmon	…
netns	net/netns: fix segv when no tailscale interface is found	2 years ago
netstat	…
netutil	…
packet	net/packet: add NAT support for DCCP and GRE	2 years ago
ping	net/ping,netcheck: add v6 pinging capabilities to pinger (#7971)	2 years ago
portmapper	all: avoid repeated default interface lookups	2 years ago
proxymux	…
routetable	…
socks5	…
sockstats	all: avoid repeated default interface lookups	2 years ago
speedtest	…
stun	wgengine/magicsock, types/nettype, etc: finish ReadFromUDPAddrPort netip migration	2 years ago
tlsdial	…
tsaddr	…
tsdial	all: avoid repeated default interface lookups	2 years ago
tshttpproxy	…
tstun	tsd: add package with System type to unify subsystem init, discovery	2 years ago
wsconn	…