From: Daniel P. Berrangé <berrange@redhat.com>

The extended clipboard message protocol requires that the client
activate the extension by requesting a psuedo encoding. If this
is not done, then any extended clipboard messages from the client
should be considered invalid and the client dropped.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20240115095119.654271-1-berrange@redhat.com>
(cherry picked from commit 4cba8388968b70fe20e290221dc421c717051fdd)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/ui/vnc.c b/ui/vnc.c
index 1ca16c0ff6..629a500adc 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -2456,6 +2456,11 @@ static int protocol_client_msg(VncState *vs, uint8_t *data, size_t len)
         }
 
         if (read_s32(data, 4) < 0) {
+            if (!vnc_has_feature(vs, VNC_FEATURE_CLIPBOARD_EXT)) {
+                error_report("vnc: extended clipboard message while disabled");
+                vnc_client_error(vs);
+                break;
+            }
             if (dlen < 4) {
                 error_report("vnc: malformed payload (header less than 4 bytes)"
                              " in extended clipboard pseudo-encoding.");
-- 
2.39.2