s390/net: fix format string mismatches

cppcheck blamed some issues in drivers/s390/net/...
They are fixed here.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <blaschka@linux.vnet.ibm.com>
Reported-by: Toralf Foerster <toralf.foerster@gmx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/s390/net/ctcm_sysfs.c b/drivers/s390/net/ctcm_sysfs.c
index 985b5dcbdac8..6bcfbbb20f04 100644
--- a/drivers/s390/net/ctcm_sysfs.c
+++ b/drivers/s390/net/ctcm_sysfs.c
@@ -34,8 +34,9 @@ static ssize_t ctcm_buffer_write(struct device *dev,
                 struct device_attribute *attr, const char *buf, size_t count)
 {
         struct net_device *ndev;
-        int bs1;
+        unsigned int bs1;
         struct ctcm_priv *priv = dev_get_drvdata(dev);
+        int rc;
 
         ndev = priv->channel[CTCM_READ]->netdev;
         if (!(priv && priv->channel[CTCM_READ] && ndev)) {
@@ -43,7 +44,9 @@ static ssize_t ctcm_buffer_write(struct device *dev,
                 return -ENODEV;
         }
 
-        sscanf(buf, "%u", &bs1);
+        rc = sscanf(buf, "%u", &bs1);
+        if (rc != 1)
+                goto einval;
         if (bs1 > CTCM_BUFSIZE_LIMIT)
                                         goto einval;
         if (bs1 < (576 + LL_HEADER_LENGTH + 2))
@@ -143,13 +146,14 @@ static ssize_t ctcm_proto_show(struct device *dev,
 static ssize_t ctcm_proto_store(struct device *dev,
                 struct device_attribute *attr, const char *buf, size_t count)
 {
-        int value;
+        int value, rc;
         struct ctcm_priv *priv = dev_get_drvdata(dev);
 
         if (!priv)
                 return -ENODEV;
-        sscanf(buf, "%u", &value);
-        if (!((value == CTCM_PROTO_S390)  ||
+        rc = sscanf(buf, "%d", &value);
+        if ((rc != 1) ||
+            !((value == CTCM_PROTO_S390)  ||
               (value == CTCM_PROTO_LINUX) ||
               (value == CTCM_PROTO_MPC) ||
               (value == CTCM_PROTO_OS390)))