internal/pipewire: set finalizer on scc

This prevents leaking the socket and pipe fds.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pipewire/securitycontext.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"io"
 	"os"
+	"runtime"
 	"syscall"
 )
 
@@ -125,8 +126,8 @@ type securityContextCloser struct {
 }
 
 // Close closes both ends of the pipe.
-func (scc *securityContextCloser) Close() error {
-	return errors.Join(
+func (scc *securityContextCloser) Close() (err error) {
+	err = errors.Join(
 		syscall.Close(scc.closeFds[1]),
 		syscall.Close(scc.closeFds[0]),
 		// there is still technically a TOCTOU here but this is internal
@@ -134,6 +135,10 @@ func (scc *securityContextCloser) Close() error {
 		// receives trusted input (e.g. from cmd/hakurei) anyway
 		os.Remove(scc.pathname),
 	)
+
+	// no need for a finalizer anymore
+	runtime.SetFinalizer(scc, nil)
+	return
 }
 
 // BindAndCreate binds a new socket to the specified pathname and pass it to Create.
@@ -162,6 +167,7 @@ func (securityContext *SecurityContext) BindAndCreate(pathname string, props SPA
 	if err := syscall.Bind(listenFd, &syscall.SockaddrUnix{Name: pathname}); err != nil {
 		return nil, os.NewSyscallError("bind", err)
 	} else if err = syscall.Listen(listenFd, 0); err != nil {
+		_ = os.Remove(pathname)
 		return nil, os.NewSyscallError("listen", err)
 	}
 
@@ -169,6 +175,8 @@ func (securityContext *SecurityContext) BindAndCreate(pathname string, props SPA
 		_ = os.Remove(pathname)
 		return nil, err
 	}
+	runtime.SetFinalizer(&scc, (*securityContextCloser).Close)
+
 	if err := securityContext.Create(listenFd, scc.closeFds[1], props); err != nil {
 		_ = scc.Close()
 		return nil, err