Commit 57220bc1 authored Mar 15, 2013 by Dan Carpenter Committed by Takashi Iwai Mar 15, 2013

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>

parent b714a710

sound/oss/sequencer.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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)