linux-kernel - [PATCH] ASoC: topology: kfree kcontrol->private

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Message-Id: <20161209141747.4776-1-colin.king@canonical.com>
Date:   Fri,  9 Dec 2016 14:17:47 +0000
From:   Colin King <colin.king@...onical.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] ASoC: topology: kfree kcontrol->private_value before freeing kcontrol

From: Colin Ian King <colin.king@...onical.com>

kcontrol->private_value is being kfree'd after kcontrol has been freed
(in previous call to snd_ctl_remove).  Instead, fix this by kfreeing
the private_value before kcontrol.

CoverityScan CID#1388311 "Read from pointer after free"

Fixes: eea3dd4f1247a ("ASoC: topology: Only free TLV for volume mixers of a widget")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 sound/soc/soc-topology.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index 11feb19..b5472e0 100644
--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -514,13 +514,12 @@ static void remove_widget(struct snd_soc_component *comp,
 			    == SND_SOC_TPLG_TYPE_MIXER)
 				kfree(kcontrol->tlv.p);
 
-			snd_ctl_remove(card, kcontrol);
-
 			/* Private value is used as struct soc_mixer_control
 			 * for volume mixers or soc_bytes_ext for bytes
 			 * controls.
 			 */
 			kfree((void *)kcontrol->private_value);
+			snd_ctl_remove(card, kcontrol);
 		}
 		kfree(w->kcontrol_news);
 	}
-- 
2.10.2