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From:   Ricardo Ribalda <ribalda@chromium.org>
To:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Cezary Rojewski <cezary.rojewski@intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
        Liam Girdwood <liam.r.girdwood@linux.intel.com>,
        Jie Yang <yang.jie@linux.intel.com>,
        Mark Brown <broonie@kernel.org>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>,
        Mateusz Gorski <mateusz.gorski@linux.intel.com>,
        alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org,
        Lukasz Majczak <lma@semihalf.com>
Cc:     Ricardo Ribalda <ribalda@chromium.org>, stable@vger.kernel.org
Subject: [PATCH v3 1/2] ASoC: Intel: Skylake: skl-topology: Fix OOPs ib skl_tplg_complete
Date:   Thu, 21 Jan 2021 18:51:50 +0100
Message-Id: <20210121175151.139111-1-ribalda@chromium.org>
MIME-Version: 1.0
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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]

Cc: <stable@vger.kernel.org>
Fixes: 2d744ecf2b98 ("ASoC: Intel: Skylake: Automatic DMIC format configuration according to information from NHL")
Tested-by: Lukasz Majczak <lma@semihalf.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
v3: order local variables by length

 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..ffd37aaecdf1 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 chan_text[4];
+		char **texts;
 
-		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