diff options
| author | Stefan Hajnoczi <stefanha@redhat.com> | 2018-12-06 19:14:34 +0000 |
|---|---|---|
| committer | Alistair Strachan <astrachan@google.com> | 2019-01-15 17:08:38 -0800 |
| commit | 06477f7ef8c103a71d2e8a251681242f1846bd19 (patch) | |
| tree | 78494cfd33f6447156a6e9040b0f703fb017e530 /drivers/vhost | |
| parent | e633b6d8e0dfbb5d3497faabf19d9f42bd2f5827 (diff) | |
UPSTREAM: vhost/vsock: fix reset orphans race with close timeout
[ Upstream commit c38f57da428b033f2721b611d84b1f40bde674a8 ]
If a local process has closed a connected socket and hasn't received a
RST packet yet, then the socket remains in the table until a timeout
expires.
When a vhost_vsock instance is released with the timeout still pending,
the socket is never freed because vhost_vsock has already set the
SOCK_DONE flag.
Check if the close timer is pending and let it close the socket. This
prevents the race which can leak sockets.
Reported-by: Maximilian Riemensberger <riemensberger@cadami.net>
Cc: Graham Whaley <graham.whaley@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 06ec6679fe12cacafce68ab7b509586482a2ae1b)
Bug: 121166534
Test: Ran cuttlefish with android-4.4 + vsock adb tunnel
Signed-off-by: Cody Schuffelen <schuffelen@google.com>
Change-Id: I6b4564aebecc3938b789e56499a3f9b8bbbeb2a1
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/vsock.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index 744ee3a17768..72e914de473e 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -561,13 +561,21 @@ static void vhost_vsock_reset_orphans(struct sock *sk) * executing. */ - if (!vhost_vsock_get(vsk->remote_addr.svm_cid)) { - sock_set_flag(sk, SOCK_DONE); - vsk->peer_shutdown = SHUTDOWN_MASK; - sk->sk_state = SS_UNCONNECTED; - sk->sk_err = ECONNRESET; - sk->sk_error_report(sk); - } + /* If the peer is still valid, no need to reset connection */ + if (vhost_vsock_get(vsk->remote_addr.svm_cid)) + return; + + /* If the close timeout is pending, let it expire. This avoids races + * with the timeout callback. + */ + if (vsk->close_work_scheduled) + return; + + sock_set_flag(sk, SOCK_DONE); + vsk->peer_shutdown = SHUTDOWN_MASK; + sk->sk_state = SS_UNCONNECTED; + sk->sk_err = ECONNRESET; + sk->sk_error_report(sk); } static int vhost_vsock_dev_release(struct inode *inode, struct file *file) |