linux-kernel - [PATCH][next] ASoC: topology: fix memory leak on se when kstrdup fails

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Message-Id: <20180328181725.17226-1-colin.king@canonical.com>
Date:   Wed, 28 Mar 2018 19:17:25 +0100
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:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] ASoC: topology: fix memory leak on se when kstrdup fails

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

In the case when kstrdup fails to allocation memory for kc[i].name
the error exit path does not free up 'se' leading to a small leak.
Fix this by kfree'ing 'se' before jumping to err_se and since
kc[i].private_value is zero we end up avoiding kfree'ing the
rest of the unallocated objects in se.

Detected by CoverityScan, CID#1466991 ("Reseource leak")

Fixes: 267e2c6fd7ca ("ASoC: topology: Fix kcontrol name string handling")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 sound/soc/soc-topology.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index fa27d0fca6dc..71b20d795b51 100644
--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -1325,8 +1325,10 @@ static struct snd_kcontrol_new *soc_tplg_dapm_widget_denum_create(
 			ec->hdr.name);
 
 		kc[i].name = kstrdup(ec->hdr.name, GFP_KERNEL);
-		if (kc[i].name == NULL)
+		if (kc[i].name == NULL) {
+			kfree(se);
 			goto err_se;
+		}
 		kc[i].private_value = (long)se;
 		kc[i].iface = SNDRV_CTL_ELEM_IFACE_MIXER;
 		kc[i].access = ec->hdr.access;
-- 
2.15.1