[PATCH -next] intel_th: msu: Fix possible memory leak in mode_store()

[Wei Yongjun]

'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 <weiyongj...@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 fc9f15f36ad4..2e7a04f566d4 100644
--- a/drivers/hwtracing/intel_th/msu.c
+++ b/drivers/hwtracing/intel_th/msu.c
@@ -1849,8 +1849,10 @@ mode_store(struct device *dev, struct device_attribute 
*attr, const char *buf,
 
        mode = kstrndup(buf, len, GFP_KERNEL);
        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) {