diff options
| author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2021-11-10 11:38:00 +0100 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2021-11-22 11:14:28 +0100 |
| commit | 2e572baf659f5a457c876c6b2d02a217afb401c5 (patch) | |
| tree | c78a5968bd2d5ba181b4cd1ea4e6bdef749559cc /ui/vnc-clipboard.c | |
| parent | c3abdb2faff62e3ded21bf8c3ef493ed70785623 (diff) | |
ui/vnc-clipboard: fix adding notifier twice
vnc_server_cut_text_caps() is not guaranteed to be called only once.
If it called twice, we finally call notifier_list_add() twice with same
element. Which leads to loopback QLIST. So, on next
notifier_list_notify() we'll loop forever and QEMU stuck.
So, let's only register new notifier if it's not yet registered.
Note, that similar check is used in vdagent_chr_recv_caps() (before
call qemu_clipboard_peer_register()), and also before
qemu_clipboard_peer_unregister() call in vdagent_disconnect() and in
vnc_disconnect_finish().
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20211110103800.2266729-1-vsementsov@virtuozzo.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'ui/vnc-clipboard.c')
| -rw-r--r-- | ui/vnc-clipboard.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/ui/vnc-clipboard.c b/ui/vnc-clipboard.c index 9f077965d0..67284b556c 100644 --- a/ui/vnc-clipboard.c +++ b/ui/vnc-clipboard.c @@ -316,8 +316,10 @@ void vnc_server_cut_text_caps(VncState *vs) caps[1] = 0; vnc_clipboard_send(vs, 2, caps); - vs->cbpeer.name = "vnc"; - vs->cbpeer.update.notify = vnc_clipboard_notify; - vs->cbpeer.request = vnc_clipboard_request; - qemu_clipboard_peer_register(&vs->cbpeer); + if (!vs->cbpeer.update.notify) { + vs->cbpeer.name = "vnc"; + vs->cbpeer.update.notify = vnc_clipboard_notify; + vs->cbpeer.request = vnc_clipboard_request; + qemu_clipboard_peer_register(&vs->cbpeer); + } } |