[PATCH] intel_th: msu: fix missing allocation failure check on a kstrndup

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

kstrndup can potentially return NULL, so add a null memory check to
avoid a null pointer reference later on.

Addresses-Coverity: ("Dereference null return")
Fixes: 615c164da0eb ("intel_th: msu: Introduce buffer interface")
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
 drivers/hwtracing/intel_th/msu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hwtracing/intel_th/msu.c b/drivers/hwtracing/intel_th/msu.c
index 4892ac446c01..dd7e3c304ee5 100644
--- a/drivers/hwtracing/intel_th/msu.c
+++ b/drivers/hwtracing/intel_th/msu.c
@@ -1848,6 +1848,8 @@ mode_store(struct device *dev, struct device_attribute 
*attr, const char *buf,
                len = cp - buf;
 
        mode = kstrndup(buf, len, GFP_KERNEL);
+       if (!mode)
+               return -ENOMEM;
        i = match_string(msc_mode, ARRAY_SIZE(msc_mode), mode);
        if (i >= 0)
                goto found;
-- 
2.20.1