[GIT PULL 5/7] intel_th: msu: Fix possible memory leak in mode_store()

[Alexander Shishkin]

From: Wei Yongjun <weiyongjun1@xxxxxxxxxx>

'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@xxxxxxxxxx>
Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/lkml/20190801013825.182543-1-weiyongjun1@xxxxxxxxxx/
---
 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