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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
..
art	net/art: skip tests on CI for now	2 years ago
connstats	net/connstats: exclude traffic with internal Tailscale service (#7904)	2 years ago
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	all: update copyright and license headers	2 years ago
interfaces	all: move network monitoring from wgengine/monitor to net/netmon	2 years ago
memnet	net/memnet: rename from net/nettest	2 years ago
netaddr	all: update copyright and license headers	2 years ago
netcheck	net/ping,netcheck: add v6 pinging capabilities to pinger (#7971)	2 years ago
neterror	net/neterror, wgengine/magicsock: use UDP GSO and GRO on Linux (#7791)	2 years ago
netknob	all: update copyright and license headers	2 years ago
netmon	all: move network monitoring from wgengine/monitor to net/netmon	2 years ago
netns	net/netns: fix segv when no tailscale interface is found	2 years ago
netstat	net/{netns,netstat}: use new x/sys/cpu.IsBigEndian	2 years ago
netutil	all: replace /kb/ links with /s/ equivalents	2 years ago
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	all: update copyright and license headers	2 years ago
routetable	net/routetable: include unknown flags in the routetable doctor output	2 years ago
socks5	net/socks5: add password auth support	2 years ago
sockstats	all: avoid repeated default interface lookups	2 years ago
speedtest	all: update copyright and license headers	2 years ago
stun	wgengine/magicsock, types/nettype, etc: finish ReadFromUDPAddrPort netip migration	2 years ago
tlsdial	health, net/tlsdial: add healthcheck for self-signed cert	2 years ago
tsaddr	all: replace /kb/ links with /s/ equivalents	2 years ago
tsdial	all: avoid repeated default interface lookups	2 years ago
tshttpproxy	net/tshttpproxy: don't proxy through ourselves	2 years ago
tstun	tsd: add package with System type to unify subsystem init, discovery	2 years ago
wsconn	all: update copyright and license headers	2 years ago