Jacek Caban : server: Choose newer async object when searching from client pointer.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 13204d87cfc35b436e50925701b55e55f1ab165a
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=13204d87cfc35b436e50925701...

Author: Jacek Caban <jacek(a)codeweavers.com>
Date:   Fri Feb 10 16:05:39 2017 +0100

server: Choose newer async object when searching from client pointer.

This fixes a race. Client may release and reuse async pointer while
processing APC_ASYNC_IO. It is, however, guaranteed that
get_async_result will be called on the newest one known to the server.

Signed-off-by: Jacek Caban <jacek(a)codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard(a)winehq.org>

---

 server/async.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/server/async.c b/server/async.c
index ec46103..ef548d1 100644
--- a/server/async.c
+++ b/server/async.c
@@ -255,7 +255,7 @@ struct async *create_async( struct thread *thread, struct async_queue *queue, co
     else async->iosb = NULL;
 
     list_add_tail( &queue->queue, &async->queue_entry );
-    list_add_tail( &thread->process->asyncs, &async->process_entry );
+    list_add_head( &thread->process->asyncs, &async->process_entry );
     grab_object( async );
 
     if (queue->fd) set_fd_signaled( queue->fd, 0 );