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ALSA: seq: potential out of bounds in do_control()

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Smatch complains that "control" is user specifigy and needs to be
capped.  The call tree to understand this warning is quite long.

snd_seq_write()  <-- get the event from the user
  snd_seq_client_enqueue_event()
    snd_seq_deliver_event()
      deliver_to_subscribers()
        snd_seq_deliver_single_event()
          snd_opl3_oss_event_input()
            snd_midi_process_event()
              do_control()

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Dan Carpenter 2015-02-11 18:10:54 +03:00 committed by Takashi Iwai
parent 25a0707cf6
commit 0b444af8da
1 changed files with 3 additions and 0 deletions
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3
sound/core/seq/seq_midi_emul.c
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@ -269,6 +269,9 @@ do_control(struct snd_midi_op *ops, void *drv, struct snd_midi_channel_set *chse
{
int i;
if (control >= ARRAY_SIZE(chan->control))
return;
/* Switches */
if ((control >=64 && control <=69) || (control >= 80 && control <= 83)) {
/* These are all switches; either off or on so set to 0 or 127 */