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ALSA: hda - Fix possible races of accesses to connection list array

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Like the previous fixes for cache hash accesses, a protection over
accesses to the widget connection list array must be provided.
Together with this action, remove snd_hda_get_conn_list() which can be
always race, and replace it with either snd_hda_get_num_conns() or
snd_hda_get_connections() calls.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2012-05-19 17:21:25 +02:00
parent c882246d84
commit 09cf03b80c
4 changed files with 56 additions and 60 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
sound/pci/hda/patch_realtek.c
View File

@@ -349,7 +349,7 @@ static int alc_mux_select(struct hda_codec *codec, unsigned int adc_idx,
nid = get_capsrc(spec, adc_idx);
/* no selection? */
num_conns = snd_hda_get_conn_list(codec, nid, NULL);
num_conns = snd_hda_get_num_conns(codec, nid);
if (num_conns <= 1)
return 1;
@@ -2543,7 +2543,6 @@ static int alc_auto_fill_adc_caps(struct hda_codec *codec)
nid = codec->start_nid;
for (i = 0; i < codec->num_nodes; i++, nid++) {
hda_nid_t src;
const hda_nid_t *list;
unsigned int caps = get_wcaps(codec, nid);
int type = get_wcaps_type(caps);
@@ -2554,6 +2553,7 @@ static int alc_auto_fill_adc_caps(struct hda_codec *codec)
src = nid;
for (;;) {
int n;
hda_nid_t conn_nid;
type = get_wcaps_type(get_wcaps(codec, src));
if (type == AC_WID_PIN)
break;
@@ -2561,13 +2561,14 @@ static int alc_auto_fill_adc_caps(struct hda_codec *codec)
cap_nids[nums] = src;
break;
}
n = snd_hda_get_conn_list(codec, src, &list);
n = snd_hda_get_num_conns(codec, src);
if (n > 1) {
cap_nids[nums] = src;
break;
} else if (n != 1)
break;
src = *list;
if (snd_hda_get_connections(codec, src, &src, 1) != 1)
break;
}
if (++nums >= max_nums)
break;
@@ -2708,7 +2709,7 @@ static void alc_auto_init_analog_input(struct hda_codec *codec)
/* mute all loopback inputs */
if (spec->mixer_nid) {
int nums = snd_hda_get_conn_list(codec, spec->mixer_nid, NULL);
int nums = snd_hda_get_num_conns(codec, spec->mixer_nid);
for (i = 0; i < nums; i++)
snd_hda_codec_write(codec, spec->mixer_nid, 0,
AC_VERB_SET_AMP_GAIN_MUTE,
@@ -3338,7 +3339,7 @@ static int alc_auto_add_sw_ctl(struct hda_codec *codec,
if (wid_type == AC_WID_PIN || wid_type == AC_WID_AUD_OUT) {
type = ALC_CTL_WIDGET_MUTE;
val = HDA_COMPOSE_AMP_VAL(nid, chs, 0, HDA_OUTPUT);
} else if (snd_hda_get_conn_list(codec, nid, NULL) == 1) {
} else if (snd_hda_get_num_conns(codec, nid) == 1) {
type = ALC_CTL_WIDGET_MUTE;
val = HDA_COMPOSE_AMP_VAL(nid, chs, 0, HDA_INPUT);
} else {
@@ -3898,7 +3899,7 @@ static void alc_remove_invalid_adc_nids(struct hda_codec *codec)
nums = 0;
for (n = 0; n < spec->num_adc_nids; n++) {
hda_nid_t cap = spec->private_capsrc_nids[n];
int num_conns = snd_hda_get_conn_list(codec, cap, NULL);
int num_conns = snd_hda_get_num_conns(codec, cap);
for (i = 0; i < imux->num_items; i++) {
hda_nid_t pin = spec->imux_pins[i];
if (pin) {
@@ -4027,7 +4028,7 @@ static void select_or_unmute_capsrc(struct hda_codec *codec, hda_nid_t cap,
if (get_wcaps_type(get_wcaps(codec, cap)) == AC_WID_AUD_MIX) {
snd_hda_codec_amp_stereo(codec, cap, HDA_INPUT, idx,
HDA_AMP_MUTE, 0);
} else if (snd_hda_get_conn_list(codec, cap, NULL) > 1) {
} else if (snd_hda_get_num_conns(codec, cap) > 1) {
snd_hda_codec_write_cache(codec, cap, 0,
AC_VERB_SET_CONNECT_SEL, idx);
}