linux-kernel - [PATCH v2] ASoC: Intel: Skylake: Check the kcontrol against NULL

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Date:   Thu, 17 Dec 2020 14:04:39 +0100
From:   Lukasz Majczak <lma@...ihalf.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Mateusz Gorski <mateusz.gorski@...ux.intel.com>
Cc:     Marcin Wojtas <mw@...ihalf.com>,
        Radoslaw Biernacki <rad@...ihalf.com>,
        Alex Levin <levinale@...gle.com>,
        Guenter Roeck <groeck@...gle.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, Lukasz Majczak <lma@...ihalf.com>,
        stable@...r.kernel.org
Subject: [PATCH v2] ASoC: Intel: Skylake: Check the kcontrol against NULL

There is no check for the kcontrol against NULL and in some cases
it causes kernel to crash.

Fixes: 2d744ecf2b984 ("ASoC: Intel: Skylake: Automatic DMIC format configuration according to information from NHLT")
Cc: <stable@...r.kernel.org> # 5.4+
Signed-off-by: Lukasz Majczak <lma@...ihalf.com>
Reviewed-by: Mateusz Gorski <mateusz.gorski@...ux.intel.com>
---
 sound/soc/intel/skylake/skl-topology.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)
 v1 -> v2: fixed coding style

diff --git a/sound/soc/intel/skylake/skl-topology.c b/sound/soc/intel/skylake/skl-topology.c
index ae466cd592922..8f0bfda7096a9 100644
--- a/sound/soc/intel/skylake/skl-topology.c
+++ b/sound/soc/intel/skylake/skl-topology.c
@@ -3618,12 +3618,18 @@ static void skl_tplg_complete(struct snd_soc_component *component)
 	int i;
 
 	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 snd_kcontrol *kcontrol;
+		struct soc_enum *se;
+		char **texts;
 		char chan_text[4];
 
+		kcontrol = dobj->control.kcontrol;
+		if (!kcontrol)
+			continue;
+
+		se = (struct soc_enum *)kcontrol->private_value;
+		texts = dobj->control.dtexts;
+
 		if (dobj->type != SND_SOC_DOBJ_ENUM ||
 		    dobj->control.kcontrol->put !=
 		    skl_tplg_multi_config_set_dmic)
-- 
2.25.1