Fix sound and clipboard crashes

- In case clipboard is not initialized, clipboard_data_in returns
    (fixes a segfault)
- If less than 4 bytes are sent to sound_send_wave_data_chunk, it
  returns
    (fixes a segfault)
- When sending sound initiliazation messages set g_chan in chansrv to 0,
  so the server waits for client to reply (this makes sound work afte
  reconnecting)
- In process_message_channel_setup, clear any leftover data in
  chan_items

1 files changed, 6 insertions, 0 deletions

diff --git a/sesman/chansrv/clipboard.c b/sesman/chansrv/clipboard.c
index 27c45fff..dc6d2484 100644
--- a/sesman/chansrv/clipboard.c
+++ b/sesman/chansrv/clipboard.c
@@ -1490,6 +1490,12 @@ clipboard_data_in(struct stream *s, int chan_id, int chan_flags, int length,
     struct stream *ls;
     char *holdp;
 
+    if (! g_clip_up) {
+        LOG(10, ("aborting clipboard_data_in - clipboard has not been initialized"));
+        // we return 0 here to indicate no protocol problem occured
+        return 0;
+    }
+
     LLOGLN(10, ("clipboard_data_in: chan_id %d "
             "chan_flags 0x%x length %d total_length %d "
             "in_request %d g_ins->size %d",