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net/netmon: add extra panic guard around ParseRIB

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We once again have a report of a panic from ParseRIB. This panic guard
should probably remain permanent.

Updates #14201

This reverts commit de9d4b2f886b6bf5cf0fe9be6c17d080267acef1.

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker 2025-02-03 10:24:42 -08:00 committed by James Tucker
parent 97c4c0ecf0
commit 80a100b3cb
1 changed files with 13 additions and 1 deletions
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14
net/netmon/netmon_darwin.go
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@ -56,7 +56,19 @@ func (m *darwinRouteMon) Receive() (message, error) {
if err != nil {
return nil, err
}
msgs, err := route.ParseRIB(route.RIBTypeRoute, m.buf[:n])
msgs, err := func() (msgs []route.Message, err error) {
defer func() {
// #14201: permanent panic protection, as we have been burned by
// ParseRIB panics too many times.
msg := recover()
if msg != nil {
msgs = nil
m.logf("[unexpected] netmon: panic in route.ParseRIB from % 02x", m.buf[:n])
err = fmt.Errorf("panic in route.ParseRIB: %s", msg)
}
}()
return route.ParseRIB(route.RIBTypeRoute, m.buf[:n])
}()
if err != nil {
if debugRouteMessages {
m.logf("read %d bytes (% 02x), failed to parse RIB: %v", n, m.buf[:n], err)