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linux/sound/synth/emux/emux_nrpn.c
Artemii Karasev 6a32425f95 ALSA: emux: Avoid potential array out-of-bound in snd_emux_xg_control() 
snd_emux_xg_control() can be called with an argument 'param' greater
than size of 'control' array. It may lead to accessing 'control'
array at a wrong index.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Artemii Karasev <karasev@ispras.ru>
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20230207132026.2870-1-karasev@ispras.ru
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2023-02-07 14:32:33 +01:00

387 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* NRPN / SYSEX callbacks for Emu8k/Emu10k1
*
* Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de>
*/
#include "emux_voice.h"
#include <sound/asoundef.h>
/*
* conversion from NRPN/control parameters to Emu8000 raw parameters
*/
/* NRPN / CC -> Emu8000 parameter converter */
struct nrpn_conv_table {
int control;
int effect;
int (*convert)(int val);
};
/* effect sensitivity */
#define FX_CUTOFF 0
#define FX_RESONANCE 1
#define FX_ATTACK 2
#define FX_RELEASE 3
#define FX_VIBRATE 4
#define FX_VIBDEPTH 5
#define FX_VIBDELAY 6
#define FX_NUMS 7
/*
* convert NRPN/control values
*/
static int send_converted_effect(const struct nrpn_conv_table *table,
int num_tables,
struct snd_emux_port *port,
struct snd_midi_channel *chan,
int type, int val, int mode)
{
int i, cval;
for (i = 0; i < num_tables; i++) {
if (table[i].control == type) {
cval = table[i].convert(val);
snd_emux_send_effect(port, chan, table[i].effect,
cval, mode);
return 1;
}
}
return 0;
}
#define DEF_FX_CUTOFF 170
#define DEF_FX_RESONANCE 6
#define DEF_FX_ATTACK 50
#define DEF_FX_RELEASE 50
#define DEF_FX_VIBRATE 30
#define DEF_FX_VIBDEPTH 4
#define DEF_FX_VIBDELAY 1500
/* effect sensitivities for GS NRPN:
* adjusted for chaos 8MB soundfonts
*/
static const int gs_sense[] =
{
DEF_FX_CUTOFF, DEF_FX_RESONANCE, DEF_FX_ATTACK, DEF_FX_RELEASE,
DEF_FX_VIBRATE, DEF_FX_VIBDEPTH, DEF_FX_VIBDELAY
};
/* effect sensitivities for XG controls:
* adjusted for chaos 8MB soundfonts
*/
static const int xg_sense[] =
{
DEF_FX_CUTOFF, DEF_FX_RESONANCE, DEF_FX_ATTACK, DEF_FX_RELEASE,
DEF_FX_VIBRATE, DEF_FX_VIBDEPTH, DEF_FX_VIBDELAY
};
/*
* AWE32 NRPN effects
*/
static int fx_delay(int val);
static int fx_attack(int val);
static int fx_hold(int val);
static int fx_decay(int val);
static int fx_the_value(int val);
static int fx_twice_value(int val);
static int fx_conv_pitch(int val);
static int fx_conv_Q(int val);
/* function for each NRPN */ /* [range] units */
#define fx_env1_delay fx_delay /* [0,5900] 4msec */
#define fx_env1_attack fx_attack /* [0,5940] 1msec */
#define fx_env1_hold fx_hold /* [0,8191] 1msec */
#define fx_env1_decay fx_decay /* [0,5940] 4msec */
#define fx_env1_release fx_decay /* [0,5940] 4msec */
#define fx_env1_sustain fx_the_value /* [0,127] 0.75dB */
#define fx_env1_pitch fx_the_value /* [-127,127] 9.375cents */
#define fx_env1_cutoff fx_the_value /* [-127,127] 56.25cents */
#define fx_env2_delay fx_delay /* [0,5900] 4msec */
#define fx_env2_attack fx_attack /* [0,5940] 1msec */
#define fx_env2_hold fx_hold /* [0,8191] 1msec */
#define fx_env2_decay fx_decay /* [0,5940] 4msec */
#define fx_env2_release fx_decay /* [0,5940] 4msec */
#define fx_env2_sustain fx_the_value /* [0,127] 0.75dB */
#define fx_lfo1_delay fx_delay /* [0,5900] 4msec */
#define fx_lfo1_freq fx_twice_value /* [0,127] 84mHz */
#define fx_lfo1_volume fx_twice_value /* [0,127] 0.1875dB */
#define fx_lfo1_pitch fx_the_value /* [-127,127] 9.375cents */
#define fx_lfo1_cutoff fx_twice_value /* [-64,63] 56.25cents */
#define fx_lfo2_delay fx_delay /* [0,5900] 4msec */
#define fx_lfo2_freq fx_twice_value /* [0,127] 84mHz */
#define fx_lfo2_pitch fx_the_value /* [-127,127] 9.375cents */
#define fx_init_pitch fx_conv_pitch /* [-8192,8192] cents */
#define fx_chorus fx_the_value /* [0,255] -- */
#define fx_reverb fx_the_value /* [0,255] -- */
#define fx_cutoff fx_twice_value /* [0,127] 62Hz */
#define fx_filterQ fx_conv_Q /* [0,127] -- */
static int fx_delay(int val)
{
return (unsigned short)snd_sf_calc_parm_delay(val);
}
static int fx_attack(int val)
{
return (unsigned short)snd_sf_calc_parm_attack(val);
}
static int fx_hold(int val)
{
return (unsigned short)snd_sf_calc_parm_hold(val);
}
static int fx_decay(int val)
{
return (unsigned short)snd_sf_calc_parm_decay(val);
}
static int fx_the_value(int val)
{
return (unsigned short)(val & 0xff);
}
static int fx_twice_value(int val)
{
return (unsigned short)((val * 2) & 0xff);
}
static int fx_conv_pitch(int val)
{
return (short)(val * 4096 / 1200);
}
static int fx_conv_Q(int val)
{
return (unsigned short)((val / 8) & 0xff);
}
static const struct nrpn_conv_table awe_effects[] =
{
{ 0, EMUX_FX_LFO1_DELAY, fx_lfo1_delay},
{ 1, EMUX_FX_LFO1_FREQ, fx_lfo1_freq},
{ 2, EMUX_FX_LFO2_DELAY, fx_lfo2_delay},
{ 3, EMUX_FX_LFO2_FREQ, fx_lfo2_freq},
{ 4, EMUX_FX_ENV1_DELAY, fx_env1_delay},
{ 5, EMUX_FX_ENV1_ATTACK,fx_env1_attack},
{ 6, EMUX_FX_ENV1_HOLD, fx_env1_hold},
{ 7, EMUX_FX_ENV1_DECAY, fx_env1_decay},
{ 8, EMUX_FX_ENV1_SUSTAIN, fx_env1_sustain},
{ 9, EMUX_FX_ENV1_RELEASE, fx_env1_release},
{10, EMUX_FX_ENV2_DELAY, fx_env2_delay},
{11, EMUX_FX_ENV2_ATTACK, fx_env2_attack},
{12, EMUX_FX_ENV2_HOLD, fx_env2_hold},
{13, EMUX_FX_ENV2_DECAY, fx_env2_decay},
{14, EMUX_FX_ENV2_SUSTAIN, fx_env2_sustain},
{15, EMUX_FX_ENV2_RELEASE, fx_env2_release},
{16, EMUX_FX_INIT_PITCH, fx_init_pitch},
{17, EMUX_FX_LFO1_PITCH, fx_lfo1_pitch},
{18, EMUX_FX_LFO2_PITCH, fx_lfo2_pitch},
{19, EMUX_FX_ENV1_PITCH, fx_env1_pitch},
{20, EMUX_FX_LFO1_VOLUME, fx_lfo1_volume},
{21, EMUX_FX_CUTOFF, fx_cutoff},
{22, EMUX_FX_FILTERQ, fx_filterQ},
{23, EMUX_FX_LFO1_CUTOFF, fx_lfo1_cutoff},
{24, EMUX_FX_ENV1_CUTOFF, fx_env1_cutoff},
{25, EMUX_FX_CHORUS, fx_chorus},
{26, EMUX_FX_REVERB, fx_reverb},
};
/*
* GS(SC88) NRPN effects; still experimental
*/
/* cutoff: quarter semitone step, max=255 */
static int gs_cutoff(int val)
{
return (val - 64) * gs_sense[FX_CUTOFF] / 50;
}
/* resonance: 0 to 15(max) */
static int gs_filterQ(int val)
{
return (val - 64) * gs_sense[FX_RESONANCE] / 50;
}
/* attack: */
static int gs_attack(int val)
{
return -(val - 64) * gs_sense[FX_ATTACK] / 50;
}
/* decay: */
static int gs_decay(int val)
{
return -(val - 64) * gs_sense[FX_RELEASE] / 50;
}
/* release: */
static int gs_release(int val)
{
return -(val - 64) * gs_sense[FX_RELEASE] / 50;
}
/* vibrato freq: 0.042Hz step, max=255 */
static int gs_vib_rate(int val)
{
return (val - 64) * gs_sense[FX_VIBRATE] / 50;
}
/* vibrato depth: max=127, 1 octave */
static int gs_vib_depth(int val)
{
return (val - 64) * gs_sense[FX_VIBDEPTH] / 50;
}
/* vibrato delay: -0.725msec step */
static int gs_vib_delay(int val)
{
return -(val - 64) * gs_sense[FX_VIBDELAY] / 50;
}
static const struct nrpn_conv_table gs_effects[] =
{
{32, EMUX_FX_CUTOFF, gs_cutoff},
{33, EMUX_FX_FILTERQ, gs_filterQ},
{99, EMUX_FX_ENV2_ATTACK, gs_attack},
{100, EMUX_FX_ENV2_DECAY, gs_decay},
{102, EMUX_FX_ENV2_RELEASE, gs_release},
{8, EMUX_FX_LFO1_FREQ, gs_vib_rate},
{9, EMUX_FX_LFO1_VOLUME, gs_vib_depth},
{10, EMUX_FX_LFO1_DELAY, gs_vib_delay},
};
/*
* NRPN events
*/
void
snd_emux_nrpn(void *p, struct snd_midi_channel *chan,
struct snd_midi_channel_set *chset)
{
struct snd_emux_port *port;
port = p;
if (snd_BUG_ON(!port || !chan))
return;
if (chan->control[MIDI_CTL_NONREG_PARM_NUM_MSB] == 127 &&
chan->control[MIDI_CTL_NONREG_PARM_NUM_LSB] <= 26) {
int val;
/* Win/DOS AWE32 specific NRPNs */
/* both MSB/LSB necessary */
val = (chan->control[MIDI_CTL_MSB_DATA_ENTRY] << 7) |
chan->control[MIDI_CTL_LSB_DATA_ENTRY];
val -= 8192;
send_converted_effect
(awe_effects, ARRAY_SIZE(awe_effects),
port, chan, chan->control[MIDI_CTL_NONREG_PARM_NUM_LSB],
val, EMUX_FX_FLAG_SET);
return;
}
if (port->chset.midi_mode == SNDRV_MIDI_MODE_GS &&
chan->control[MIDI_CTL_NONREG_PARM_NUM_MSB] == 1) {
int val;
/* GS specific NRPNs */
/* only MSB is valid */
val = chan->control[MIDI_CTL_MSB_DATA_ENTRY];
send_converted_effect
(gs_effects, ARRAY_SIZE(gs_effects),
port, chan, chan->control[MIDI_CTL_NONREG_PARM_NUM_LSB],
val, EMUX_FX_FLAG_ADD);
return;
}
}
/*
* XG control effects; still experimental
*/
/* cutoff: quarter semitone step, max=255 */
static int xg_cutoff(int val)
{
return (val - 64) * xg_sense[FX_CUTOFF] / 64;
}
/* resonance: 0(open) to 15(most nasal) */
static int xg_filterQ(int val)
{
return (val - 64) * xg_sense[FX_RESONANCE] / 64;
}
/* attack: */
static int xg_attack(int val)
{
return -(val - 64) * xg_sense[FX_ATTACK] / 64;
}
/* release: */
static int xg_release(int val)
{
return -(val - 64) * xg_sense[FX_RELEASE] / 64;
}
static const struct nrpn_conv_table xg_effects[] =
{
{71, EMUX_FX_CUTOFF, xg_cutoff},
{74, EMUX_FX_FILTERQ, xg_filterQ},
{72, EMUX_FX_ENV2_RELEASE, xg_release},
{73, EMUX_FX_ENV2_ATTACK, xg_attack},
};
int
snd_emux_xg_control(struct snd_emux_port *port, struct snd_midi_channel *chan,
int param)
{
if (param >= ARRAY_SIZE(chan->control))
return -EINVAL;
return send_converted_effect(xg_effects, ARRAY_SIZE(xg_effects),
port, chan, param,
chan->control[param],
EMUX_FX_FLAG_ADD);
}
/*
* receive sysex
*/
void
snd_emux_sysex(void *p, unsigned char *buf, int len, int parsed,
struct snd_midi_channel_set *chset)
{
struct snd_emux_port *port;
struct snd_emux *emu;
port = p;
if (snd_BUG_ON(!port || !chset))
return;
emu = port->emu;
switch (parsed) {
case SNDRV_MIDI_SYSEX_GS_MASTER_VOLUME:
snd_emux_update_port(port, SNDRV_EMUX_UPDATE_VOLUME);
break;
default:
if (emu->ops.sysex)
emu->ops.sysex(emu, buf, len, parsed, chset);
break;
}
}
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