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authorSunil Muthuswamy <sunilmut@microsoft.com>2019-06-13 06:52:27 +0300
committerDavid S. Miller <davem@davemloft.net>2019-06-15 05:20:20 +0300
commitd5afa82c977ea06f7119058fa0eb8519ea501031 (patch)
tree1c8950af37bfb47eb9fd0774151d49d710ab8de7 /net/vmw_vsock
parentb3733263ef23b9a2eab3dbe3cf8014091836458a (diff)
downloadlinux-d5afa82c977ea06f7119058fa0eb8519ea501031.tar.xz
vsock: correct removal of socket from the list
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>
Diffstat (limited to 'net/vmw_vsock')
-rw-r--r--net/vmw_vsock/af_vsock.c38
1 files changed, 7 insertions, 31 deletions
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index d892000770cf..6f063ed5a7fc 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -282,7 +282,8 @@ 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);
@@ -290,7 +291,8 @@ 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);
@@ -326,35 +328,10 @@ 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);
@@ -485,8 +462,7 @@ 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;