tun: avoid leaking sock fd in CreateTUN error cases
At these points, the socket file descriptor is not yet wrapped in an *os.File, so it needs to be closed explicitly on error. Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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@ -108,7 +108,6 @@ func CreateTUN(name string, mtu int) (Device, error) {
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}
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fd, err := unix.Socket(unix.AF_SYSTEM, unix.SOCK_DGRAM, 2)
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if err != nil {
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return nil, err
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}
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@ -117,6 +116,7 @@ func CreateTUN(name string, mtu int) (Device, error) {
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copy(ctlInfo.Name[:], []byte(utunControlName))
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err = unix.IoctlCtlInfo(fd, ctlInfo)
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if err != nil {
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unix.Close(fd)
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return nil, fmt.Errorf("IoctlGetCtlInfo: %w", err)
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}
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@ -127,11 +127,13 @@ func CreateTUN(name string, mtu int) (Device, error) {
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err = unix.Connect(fd, sc)
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if err != nil {
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unix.Close(fd)
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return nil, err
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}
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err = syscall.SetNonblock(fd, true)
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err = unix.SetNonblock(fd, true)
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if err != nil {
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unix.Close(fd)
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return nil, err
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}
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tun, err := CreateTUNFromFile(os.NewFile(uintptr(fd), ""), mtu)
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@ -419,6 +419,7 @@ func CreateTUN(name string, mtu int) (Device, error) {
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var flags uint16 = unix.IFF_TUN // | unix.IFF_NO_PI (disabled for TUN status hack)
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nameBytes := []byte(name)
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if len(nameBytes) >= unix.IFNAMSIZ {
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unix.Close(nfd)
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return nil, fmt.Errorf("interface name too long: %w", unix.ENAMETOOLONG)
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}
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copy(ifr[:], nameBytes)
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@ -431,17 +432,19 @@ func CreateTUN(name string, mtu int) (Device, error) {
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uintptr(unsafe.Pointer(&ifr[0])),
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)
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if errno != 0 {
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unix.Close(nfd)
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return nil, errno
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}
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err = unix.SetNonblock(nfd, true)
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if err != nil {
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unix.Close(nfd)
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return nil, err
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}
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// Note that the above -- open,ioctl,nonblock -- must happen prior to handing it to netpoll as below this line.
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fd := os.NewFile(uintptr(nfd), cloneDevicePath)
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if err != nil {
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return nil, err
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}
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return CreateTUNFromFile(fd, mtu)
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}
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