ASoC: topology: Check widget kcontrols before deref

Validate the topology input before we dereference the pointer.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index 5598e89..986b8b2 100644 (file)
--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -513,7 +513,7 @@ static void remove_widget(struct snd_soc_component *comp,
         */
        if (dobj->widget.kcontrol_type == SND_SOC_TPLG_TYPE_ENUM) {
                /* enumerated widget mixer */
-               for (i = 0; i < w->num_kcontrols; i++) {
+               for (i = 0; w->kcontrols != NULL && i < w->num_kcontrols; i++) {
                        struct snd_kcontrol *kcontrol = w->kcontrols[i];
                        struct soc_enum *se =
                                (struct soc_enum *)kcontrol->private_value;
@@ -530,7 +530,7 @@ static void remove_widget(struct snd_soc_component *comp,
                }
        } else {
                /* volume mixer or bytes controls */
-               for (i = 0; i < w->num_kcontrols; i++) {
+               for (i = 0; w->kcontrols != NULL && i < w->num_kcontrols; i++) {
                        struct snd_kcontrol *kcontrol = w->kcontrols[i];
 
                        if (dobj->widget.kcontrol_type