linux-kernel - [PATCH -next] ASoC: SOF: debug: fix possible memory leak in sof_dfsentry

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Message-ID: <20190705081637.157169-1-weiyongjun1@huawei.com>
Date:   Fri, 5 Jul 2019 08:16:37 +0000
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "Pierre-Louis Bossart" <pierre-louis.bossart@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Pan Xiuli <xiuli.pan@...ux.intel.com>
CC:     Wei Yongjun <weiyongjun1@...wei.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: [PATCH -next] ASoC: SOF: debug: fix possible memory leak in sof_dfsentry_write()

'string' is malloced in sof_dfsentry_write() and should be freed
before leaving from the error handling cases, otherwise it will cause
memory leak.

Fixes: 091c12e1f50c ("ASoC: SOF: debug: add new debugfs entries for IPC flood test")
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
 sound/soc/sof/debug.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sof/debug.c b/sound/soc/sof/debug.c
index 54bb53bfc81b..2388477a965e 100644
--- a/sound/soc/sof/debug.c
+++ b/sound/soc/sof/debug.c
@@ -162,7 +162,7 @@ static ssize_t sof_dfsentry_write(struct file *file, const char __user *buffer,
 	else
 		ret = kstrtoul(string, 0, &ipc_count);
 	if (ret < 0)
-		return ret;
+		goto out;
 
 	/* limit max duration/ipc count for flood test */
 	if (flood_duration_test) {
@@ -191,7 +191,7 @@ static ssize_t sof_dfsentry_write(struct file *file, const char __user *buffer,
 				    "error: debugfs write failed to resume %d\n",
 				    ret);
 		pm_runtime_put_noidle(sdev->dev);
-		return ret;
+		goto out;
 	}
 
 	/* flood test */