Fix socket record leak in VFS2

VFS2 socket record is not removed from the system-wide
socket table when the socket is released, which will lead
to a memory leak. This patch fixes this issue.

Fixes: #3874

Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/pkg/sentry/socket/hostinet/socket_vfs2.go b/pkg/sentry/socket/hostinet/socket_vfs2.go
index 97bc6027f..e5acbac50 100644
--- a/pkg/sentry/socket/hostinet/socket_vfs2.go
+++ b/pkg/sentry/socket/hostinet/socket_vfs2.go
@@ -77,6 +77,13 @@ func newVFS2Socket(t *kernel.Task, family int, stype linux.SockType, protocol in
 	return vfsfd, nil
 }
 
+// Release implements vfs.FileDescriptionImpl.Release.
+func (s *socketVFS2) Release(ctx context.Context) {
+	t := kernel.TaskFromContext(ctx)
+	t.Kernel().DeleteSocketVFS2(&s.vfsfd)
+	s.socketOpsCommon.Release(ctx)
+}
+
 // Readiness implements waiter.Waitable.Readiness.
 func (s *socketVFS2) Readiness(mask waiter.EventMask) waiter.EventMask {
 	return s.socketOpsCommon.Readiness(mask)