linux-kernel - [GIT PULL 5/7] intel_th: msu: Fix possible memory leak in mode

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Date:   Mon, 28 Oct 2019 09:06:49 +0200
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Wei Yongjun <weiyongjun1@...wei.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [GIT PULL 5/7] intel_th: msu: Fix possible memory leak in mode_store()

From: Wei Yongjun <weiyongjun1@...wei.com>

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

Fixes: 615c164da0eb ("intel_th: msu: Introduce buffer interface")
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Link: https://lore.kernel.org/lkml/20190801013825.182543-1-weiyongjun1@huawei.com/
---
 drivers/hwtracing/intel_th/msu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/intel_th/msu.c b/drivers/hwtracing/intel_th/msu.c
index 9dc9ae87b5e5..6d240dfae9d9 100644
--- a/drivers/hwtracing/intel_th/msu.c
+++ b/drivers/hwtracing/intel_th/msu.c
@@ -1852,8 +1852,10 @@ mode_store(struct device *dev, struct device_attribute *attr, const char *buf,
 		return -ENOMEM;
 
 	i = match_string(msc_mode, ARRAY_SIZE(msc_mode), mode);
-	if (i >= 0)
+	if (i >= 0) {
+		kfree(mode);
 		goto found;
+	}
 
 	/* Buffer sinks only work with a usable IRQ */
 	if (!msc->do_irq) {
-- 
2.23.0