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authorStefan Hajnoczi <stefanha@redhat.com>2018-12-06 19:14:34 +0000
committerMichael S. Tsirkin <mst@redhat.com>2018-12-06 14:22:34 -0500
commitc38f57da428b033f2721b611d84b1f40bde674a8 (patch)
treec65567f936e34db07096b4003010c8ba64fe9022 /drivers/vhost
parent2595646791c319cadfdbf271563aac97d0843dc7 (diff)
downloadlinux-c38f57da428b033f2721b611d84b1f40bde674a8.tar.bz2
vhost/vsock: fix reset orphans race with close timeout
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>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/vsock.c22
1 files changed, 15 insertions, 7 deletions
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index 34bc3ab40c6d..731e2ea2aeca 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -563,13 +563,21 @@ 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)