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device: serialize access to IpcSetOperation

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Interleaves IpcSetOperations would spell trouble.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder 2021-01-25 09:35:35 -08:00
parent a9ce4b762c
commit cecb41515d
2 changed files with 4 additions and 0 deletions
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1
device/device.go
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@ -23,6 +23,7 @@ type Device struct {
isUp AtomicBool // device is (going) up
isClosed AtomicBool // device is closed? (acting as guard)
log *Logger
ipcSetMu sync.Mutex // serializes UAPI set operations
// synchronized resources (locks acquired in order)

3
device/uapi.go
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@ -121,6 +121,9 @@ func (device *Device) IpcGetOperation(w io.Writer) error {
// IpcSetOperation implements the WireGuard configuration protocol "set" operation.
// See https://www.wireguard.com/xplatform/#configuration-protocol for details.
func (device *Device) IpcSetOperation(r io.Reader) (err error) {
device.ipcSetMu.Lock()
defer device.ipcSetMu.Unlock()
defer func() {
if err != nil {
device.log.Error.Println(err)