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device: do not allow get to run while set runs

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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
2021-01-28 15:26:22 +01:00
parent 34c047c762
commit 6a128dde71
2 changed files with 7 additions and 3 deletions
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7
device/uapi.go
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@@ -50,6 +50,9 @@ var byteBufferPool = &sync.Pool{
// IpcGetOperation implements the WireGuard configuration protocol "get" operation.
// See https://www.wireguard.com/xplatform/#configuration-protocol for details.
func (device *Device) IpcGetOperation(w io.Writer) error {
device.ipcMutex.RLock()
defer device.ipcMutex.RUnlock()
buf := byteBufferPool.Get().(*bytes.Buffer)
buf.Reset()
defer byteBufferPool.Put(buf)
@@ -137,8 +140,8 @@ 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()
device.ipcMutex.Lock()
defer device.ipcMutex.Unlock()
defer func() {
if err != nil {