vsock: correct removal of socket from the list

BugLink: https://bugs.launchpad.net/bugs/1839213
commit d5afa82c977ea06f7119058fa0eb8519ea501031 upstream.

The current vsock code for removal of socket from the list is both
subject to race and inefficient. It takes the lock, checks whether
the socket is in the list, drops the lock and if the socket was on the
list, deletes it from the list. This is subject to race because as soon
as the lock is dropped once it is checked for presence, that condition
cannot be relied upon for any decision. It is also inefficient because
if the socket is present in the list, it takes the lock twice.

Signed-off-by: Sunil Muthuswamy <sunilmut@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index ec37025477adcde389728e639d125cb1a28a7bea..2819286769c1538acd02d7ce9ecb2cbe2edfe094 100644 (file)
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -281,7 +281,8 @@ EXPORT_SYMBOL_GPL(vsock_insert_connected);
 void vsock_remove_bound(struct vsock_sock *vsk)
 {
        spin_lock_bh(&vsock_table_lock);
-       __vsock_remove_bound(vsk);
+       if (__vsock_in_bound_table(vsk))
+               __vsock_remove_bound(vsk);
        spin_unlock_bh(&vsock_table_lock);
 }
 EXPORT_SYMBOL_GPL(vsock_remove_bound);
@@ -289,7 +290,8 @@ EXPORT_SYMBOL_GPL(vsock_remove_bound);
 void vsock_remove_connected(struct vsock_sock *vsk)
 {
        spin_lock_bh(&vsock_table_lock);
-       __vsock_remove_connected(vsk);
+       if (__vsock_in_connected_table(vsk))
+               __vsock_remove_connected(vsk);
        spin_unlock_bh(&vsock_table_lock);
 }
 EXPORT_SYMBOL_GPL(vsock_remove_connected);
@@ -325,35 +327,10 @@ struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
 }
 EXPORT_SYMBOL_GPL(vsock_find_connected_socket);
 
-static bool vsock_in_bound_table(struct vsock_sock *vsk)
-{
-       bool ret;
-
-       spin_lock_bh(&vsock_table_lock);
-       ret = __vsock_in_bound_table(vsk);
-       spin_unlock_bh(&vsock_table_lock);
-
-       return ret;
-}
-
-static bool vsock_in_connected_table(struct vsock_sock *vsk)
-{
-       bool ret;
-
-       spin_lock_bh(&vsock_table_lock);
-       ret = __vsock_in_connected_table(vsk);
-       spin_unlock_bh(&vsock_table_lock);
-
-       return ret;
-}
-
 void vsock_remove_sock(struct vsock_sock *vsk)
 {
-       if (vsock_in_bound_table(vsk))
-               vsock_remove_bound(vsk);
-
-       if (vsock_in_connected_table(vsk))
-               vsock_remove_connected(vsk);
+       vsock_remove_bound(vsk);
+       vsock_remove_connected(vsk);
 }
 EXPORT_SYMBOL_GPL(vsock_remove_sock);
 
@@ -484,8 +461,7 @@ static void vsock_pending_work(struct work_struct *work)
         * incoming packets can't find this socket, and to reduce the reference
         * count.
         */
-       if (vsock_in_connected_table(vsk))
-               vsock_remove_connected(vsk);
+       vsock_remove_connected(vsk);
 
        sk->sk_state = TCP_CLOSE;