A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 03:01:39 -04:00
Code Issues Projects Releases Packages Wiki Activity

vhost/vsock: fix reset orphans race with close timeout

Browse source 
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 <[email protected]>
Cc: Graham Whaley <[email protected]>
Signed-off-by: Stefan Hajnoczi <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
This commit is contained in:
Stefan Hajnoczi 2018-12-06 19:14:34 +00:00 • committed by Michael S. Tsirkin
commit c38f57da42
1 changed files with 15 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

22
drivers/vhost/vsock.c
View file

@ -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)