Re: [PATCH 1/2] ASoC: codecs: lpass-tx-macro: Fix enum kcontrol accesses

[Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>]

On 7/29/26 8:38 PM, Dawid Wróbel via B4 Relay wrote:
> From: Dawid Wróbel <me@dawidwrobel.com>
> 
> The "DEC0 MODE" to "DEC7 MODE" controls are enumerated, but
> tx_macro_dec_mode_get() and tx_macro_dec_mode_put() access their
> value through ucontrol->value.integer.value[0] (a long) instead of
> ucontrol->value.enumerated.item[0] (an unsigned int).
> 
> This same pattern was fixed in the sibling drivers by
> commit bcfe5f76cc40 ("ASoC: codecs: rx-macro: fix accessing array
> out of bounds for enum type") and
> commit 0ea5eff7c606 ("ASoC: codecs: va-macro: fix accessing array
> out of bounds for enum type"), but tx-macro was missed.
> 
> On 64-bit kernels built with CONFIG_SND_CTL_DEBUG, the elem value
> sanity check catches the 4 bytes written past the enumerated item
> and every read of these controls fails with -EINVAL:
> 
>   snd-sm8250 sound: control 2:0:0:DEC0 MODE:0: access overflow
> 
> Fixes: c39667ddcfc5 ("ASoC: codecs: lpass-tx-macro: add support for lpass tx macro")
> Assisted-by: Claude:claude-fable-5
> Signed-off-by: Dawid Wróbel <me@dawidwrobel.com>

CC Stable

Once added


Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>

--srini
> ---
>  sound/soc/codecs/lpass-tx-macro.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/soc/codecs/lpass-tx-macro.c b/sound/soc/codecs/lpass-tx-macro.c
> index f7d168f557dd..0cbf50647ff5 100644
> --- a/sound/soc/codecs/lpass-tx-macro.c
> +++ b/sound/soc/codecs/lpass-tx-macro.c
> @@ -1075,7 +1075,7 @@ static int tx_macro_dec_mode_get(struct snd_kcontrol *kcontrol,
>  	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
>  	int path = e->shift_l;
>  
> -	ucontrol->value.integer.value[0] = tx->dec_mode[path];
> +	ucontrol->value.enumerated.item[0] = tx->dec_mode[path];
>  
>  	return 0;
>  }
> @@ -1084,7 +1084,7 @@ static int tx_macro_dec_mode_put(struct snd_kcontrol *kcontrol,
>  				 struct snd_ctl_elem_value *ucontrol)
>  {
>  	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
> -	int value = ucontrol->value.integer.value[0];
> +	int value = ucontrol->value.enumerated.item[0];
>  	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
>  	int path = e->shift_l;
>  	struct tx_macro *tx = snd_soc_component_get_drvdata(component);
>