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@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

server: Choose newer async object when searching from client pointer.
13204d87 · Jacek Caban · Alexandre Julliard · e07d20f3 · 13204d87
Commit 13204d87 authored Feb 10, 2017 by Jacek Caban Committed by Alexandre Julliard Feb 14, 2017
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async.c server/async.c +1 -1

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--- 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 );