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From:   Ricardo Ribalda <ribalda@chromium.org>
To:     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>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org
Cc:     Ricardo Ribalda <ribalda@chromium.org>
Subject: [PATCH] ASoC: Intel: Skylake: skl-topology: Fix OOPs ib skl_tplg_complete
Date:   Fri, 11 Dec 2020 18:06:29 +0100
Message-Id: <20201211170629.871085-1-ribalda@chromium.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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]

Fixes: 2d744ecf2b98 ("ASoC: Intel: Skylake: Automatic DMIC format configuration according to information from NHL")
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 sound/soc/intel/skylake/skl-topology.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/sound/soc/intel/skylake/skl-topology.c b/sound/soc/intel/skylake/skl-topology.c
index 40bee10b0c65..0955cbb4e918 100644
--- a/sound/soc/intel/skylake/skl-topology.c
+++ b/sound/soc/intel/skylake/skl-topology.c
@@ -3619,19 +3619,20 @@ 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;
 		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++) {
-			struct snd_ctl_elem_value val;
+			struct snd_ctl_elem_value val = {};
 
 			if (strstr(texts[i], chan_text)) {
 				val.value.enumerated.item[0] = i;
-- 
2.29.2.576.ga3fc446d84-goog