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ASoC: wm_adsp: Pass full name to snd_ctl_notify 

A call to wm_adsp_write_ctl() could cause a kernel crash if it
does not retrieve a valid kcontrol from snd_soc_card_get_kcontrol().
This can happen due to a missing control name prefix. Then,
snd_ctl_notify() crashes when it tries to use the id field.

Modified wm_adsp_write_ctl() to incorporate the name_prefix (if applicable)
such that it is able to retrieve a valid id field from the kcontrol
once the platform has booted.

Fixes: eb65ccdb08 ("ASoC: wm_adsp: Expose mixer control API")
Signed-off-by: Adam Brickman <Adam.Brickman@cirrus.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20201001152425.8590-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Adam Brickman 2020-10-01 16:24:25 +01:00 committed by Mark Brown
parent 6bf28e8a05
commit 20441614d8
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 19 additions and 1 deletions
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20
sound/soc/codecs/wm_adsp.c
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@ -2049,6 +2049,7 @@ int wm_adsp_write_ctl(struct wm_adsp *dsp, const char *name, int type,
{
struct wm_coeff_ctl *ctl;
struct snd_kcontrol *kcontrol;
char ctl_name[SNDRV_CTL_ELEM_ID_NAME_MAXLEN];
int ret;
ctl = wm_adsp_get_ctl(dsp, name, type, alg);
@ -2059,8 +2060,25 @@ int wm_adsp_write_ctl(struct wm_adsp *dsp, const char *name, int type,
return -EINVAL;
ret = wm_coeff_write_ctrl(ctl, buf, len);
if (ret)
return ret;
if (ctl->flags & WMFW_CTL_FLAG_SYS)
return 0;
if (dsp->component->name_prefix)
snprintf(ctl_name, SNDRV_CTL_ELEM_ID_NAME_MAXLEN, "%s %s",
dsp->component->name_prefix, ctl->name);
else
snprintf(ctl_name, SNDRV_CTL_ELEM_ID_NAME_MAXLEN, "%s",
ctl->name);
kcontrol = snd_soc_card_get_kcontrol(dsp->component->card, ctl_name);
if (!kcontrol) {
adsp_err(dsp, "Can't find kcontrol %s\n", ctl_name);
return -EINVAL;
}
kcontrol = snd_soc_card_get_kcontrol(dsp->component->card, ctl->name);
snd_ctl_notify(dsp->component->card->snd_card,
SNDRV_CTL_EVENT_MASK_VALUE, &kcontrol->id);