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| author | Adam Brickman <Adam.Brickman@cirrus.com> | 2020-10-01 16:24:25 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-10-01 18:26:19 +0100 |
| commit | 20441614d89867142060d3bcd79cc111d8ba7a8e (patch) | |
| tree | c5652d0882b51aa65bae76aaa5d03801854dba0a /sound/soc/codecs | |
| parent | 6bf28e8a05fda0547658fd51d0acc83dcac6c703 (diff) | |
| download | linux-stable-20441614d89867142060d3bcd79cc111d8ba7a8e.tar.gz linux-stable-20441614d89867142060d3bcd79cc111d8ba7a8e.tar.bz2 linux-stable-20441614d89867142060d3bcd79cc111d8ba7a8e.zip | |
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: eb65ccdb0836 ("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>
Diffstat (limited to 'sound/soc/codecs')
| -rw-r--r-- | sound/soc/codecs/wm_adsp.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c index 410cca57da52..344bd2c33bea 100644 --- a/sound/soc/codecs/wm_adsp.c +++ b/sound/soc/codecs/wm_adsp.c @@ -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); |