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wgengine/wgcfg: always close io.Pipe

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In DeviceConfig, we did not close r after calling FromUAPI.
If FromUAPI returned early due to an error, then it might
not have read all the data that IpcGetOperation wanted to write.
As a result, IpcGetOperation could hang, as in #3220.

We were also closing the wrong end of the pipe after IpcSetOperation
in ReconfigDevice.

To ensure that we get all available information to diagnose
such a situation, include all errors anytime something goes wrong.

This should fix the immediate crashing problem in #3220.
We'll then need to figure out why IpcGetOperation was failing.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder 2021-10-29 13:26:45 -07:00 committed by Josh Bleecher Snyder
parent 3fd5f4380f
commit c467ed0b62
1 changed files with 9 additions and 13 deletions
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22
wgengine/wgcfg/device.go
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@ -10,6 +10,7 @@
"golang.zx2c4.com/wireguard/device"
"tailscale.com/types/logger"
"tailscale.com/util/multierr"
)
func DeviceConfig(d *device.Device) (*Config, error) {
@ -19,12 +20,10 @@ func DeviceConfig(d *device.Device) (*Config, error) {
errc <- d.IpcGetOperation(w)
w.Close()
}()
cfg, err := FromUAPI(r)
// Prefer errors from IpcGetOperation.
if setErr := <-errc; setErr != nil {
return nil, setErr
}
// Check FromUAPI error.
cfg, fromErr := FromUAPI(r)
r.Close()
getErr := <-errc
err := multierr.New(getErr, fromErr)
if err != nil {
return nil, err
}
@ -51,14 +50,11 @@ func ReconfigDevice(d *device.Device, cfg *Config, logf logger.Logf) (err error)
errc := make(chan error, 1)
go func() {
errc <- d.IpcSetOperation(r)
w.Close()
r.Close()
}()
err = cfg.ToUAPI(w, prev)
toErr := cfg.ToUAPI(w, prev)
w.Close()
// Prefer errors from IpcSetOperation.
if setErr := <-errc; setErr != nil {
return setErr
}
return err // err (if any) from cfg.ToUAPI
setErr := <-errc
return multierr.New(setErr, toErr)
}