s390/ctcm: fix variable dereferenced before check

[ Upstream commit 2c50c6867c85afee6f2b3bcbc50fc9d0083d1343 ]

Found by cppcheck and smatch.
smatch complains about
drivers/s390/net/ctcm_sysfs.c:43 ctcm_buffer_write() warn: variable dereferenced before check 'priv' (see line 42)

Fixes: 3c09e2647b5e ("ctcm: rename READ/WRITE defines to avoid redefinitions")
Reported-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/s390/net/ctcm_sysfs.c b/drivers/s390/net/ctcm_sysfs.c
index ded1930..e3813a7 100644 (file)
--- a/drivers/s390/net/ctcm_sysfs.c
+++ b/drivers/s390/net/ctcm_sysfs.c
@@ -39,11 +39,12 @@ static ssize_t ctcm_buffer_write(struct device *dev,
        struct ctcm_priv *priv = dev_get_drvdata(dev);
        int rc;
 
-       ndev = priv->channel[CTCM_READ]->netdev;
-       if (!(priv && priv->channel[CTCM_READ] && ndev)) {
+       if (!(priv && priv->channel[CTCM_READ] &&
+             priv->channel[CTCM_READ]->netdev)) {
                CTCM_DBF_TEXT(SETUP, CTC_DBF_ERROR, "bfnondev");
                return -ENODEV;
        }
+       ndev = priv->channel[CTCM_READ]->netdev;
 
        rc = kstrtouint(buf, 0, &bs1);
        if (rc)