On Thu, Jan 21, 2021 at 06:16:43PM +0100, Ricardo Ribalda wrote:
> If dobj->control is not initialized we end up in an OOPs during
> skl_tplg_complete:
>
> [ 26.553358] BUG: kernel NULL pointer dereference, address:
> 0000000000000078
> [ 26.561151] #PF: supervisor read access in kernel mode
> [ 26.566897] #PF: error_code(0x0000) - not-present page
> [ 26.572642] PGD 0 P4D 0
> [ 26.575479] Oops: 0000 [#1] PREEMPT SMP PTI
> [ 26.580158] CPU: 2 PID: 2082 Comm: udevd Tainted: G C
> 5.4.81 #4
> [ 26.588232] Hardware name: HP Soraka/Soraka, BIOS
> Google_Soraka.10431.106.0 12/03/2019
> [ 26.597082] RIP: 0010:skl_tplg_complete+0x70/0x144 [snd_soc_skl]
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Fixes: 2d744ecf2b98 ("ASoC: Intel: Skylake: Automatic DMIC format configuration according to information from NHL")
> Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
> ---
> sound/soc/intel/skylake/skl-topology.c | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/sound/soc/intel/skylake/skl-topology.c b/sound/soc/intel/skylake/skl-topology.c
> index ae466cd59292..1ef30ca45410 100644
> --- a/sound/soc/intel/skylake/skl-topology.c
> +++ b/sound/soc/intel/skylake/skl-topology.c
> @@ -3619,15 +3619,16 @@ static void skl_tplg_complete(struct snd_soc_component *component)
>
> list_for_each_entry(dobj, &component->dobj_list, list) {
> struct snd_kcontrol *kcontrol = dobj->control.kcontrol;
> - struct soc_enum *se =
> - (struct soc_enum *)kcontrol->private_value;
> - char **texts = dobj->control.dtexts;
> + struct soc_enum *se;
> + char **texts;
A nit-pick: Can we place this after below line?
> char chan_text[4];
>
> - if (dobj->type != SND_SOC_DOBJ_ENUM ||
> - dobj->control.kcontrol->put !=
> - skl_tplg_multi_config_set_dmic)
> + if (dobj->type != SND_SOC_DOBJ_ENUM || !kcontrol ||
> + kcontrol->put != skl_tplg_multi_config_set_dmic)
> continue;
> +
> + se = (struct soc_enum *)kcontrol->private_value;
> + texts = dobj->control.dtexts;
> sprintf(chan_text, "c%d", mach->mach_params.dmic_num);
>
> for (i = 0; i < se->items; i++) {
> --
> 2.30.0.296.g2bfb1c46d8-goog
>
--
With Best Regards,
Andy Shevchenko
