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wgengine/monitor: don't return nil, nil in darwin monitor

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We used to allow that, but now it just crashes.

Separately I need to figure out why it got into this path at all,
which is #1416.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-03-02 08:15:57 -08:00
parent b89c757817
commit 31721759f3
1 changed files with 1 additions and 1 deletions
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2
wgengine/monitor/monitor_darwin.go
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@ -58,7 +58,7 @@ func (m *darwinRouteMon) Receive() (message, error) {
msgs, err := route.ParseRIB(route.RIBTypeRoute, m.buf[:n])
if err != nil {
m.logf("read %d bytes (% 02x), failed to parse RIB: %v", n, m.buf[:n], err)
return nil, nil
return unspecifiedMessage{}, nil
}
if debugRouteMessages {
m.logf("read: %d bytes, %d msgs", n, len(msgs))