[ALSA] seq_midi_event: fix parsing of F9/FD bytes

Check for a valid event type when encoding a system real-time message to
prevent the bytes F9 or FD resulting in an empty sequencer message.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 1 insertions, 1 deletions

diff --git a/sound/core/seq/seq_midi_event.c b/sound/core/seq/seq_midi_event.c
index a15f5e68e0b6..46416771c9b3 100644
--- a/sound/core/seq/seq_midi_event.c
+++ b/sound/core/seq/seq_midi_event.c
@@ -252,7 +252,7 @@ int snd_midi_event_encode_byte(struct snd_midi_event *dev, int c,
                 ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
                 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
                 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
-                return 1;
+                return ev->type != SNDRV_SEQ_EVENT_NONE;
         }
 
         spin_lock_irqsave(&dev->lock, flags);