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sound: sequencer: cap array index in seq_chn_common_event()

"chn" here is a number between 0 and 255, but ->chn_info[] only has
16 elements so there is a potential write beyond the end of the
array.

If the seq_mode isn't SEQ_2 then we let the individual drivers
(either opl3.c or midi_synth.c) handle it.  Those functions all
do a bounds check on "chn" so I haven't changed anything here.
The opl3.c driver has up to 18 channels and not 16.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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commit 57220bc1f5924c869d8fc049e50169915ca0cb24 1 parent b714a71
Dan Carpenter authored tiwai committed
Showing with 6 additions and 0 deletions.
  1. +6 −0 sound/oss/sequencer.c
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6 sound/oss/sequencer.c
@@ -545,6 +545,9 @@ static void seq_chn_common_event(unsigned char *event_rec)
case MIDI_PGM_CHANGE:
if (seq_mode == SEQ_2)
{
+ if (chn > 15)
+ break;
+
synth_devs[dev]->chn_info[chn].pgm_num = p1;
if ((int) dev >= num_synths)
synth_devs[dev]->set_instr(dev, chn, p1);
@@ -596,6 +599,9 @@ static void seq_chn_common_event(unsigned char *event_rec)
case MIDI_PITCH_BEND:
if (seq_mode == SEQ_2)
{
+ if (chn > 15)
+ break;
+
synth_devs[dev]->chn_info[chn].bender_value = w14;
if ((int) dev < num_synths)
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