mwifiex: fix smatch errors

drivers/net/wireless/mwifiex/main.c +828 mwifiex_remove_card(52)
  error: potential null derefence 'priv'.
drivers/net/wireless/mwifiex/main.c +828 mwifiex_remove_card(52)
  error: we previously assumed 'priv' could be null (see line 820)
drivers/net/wireless/mwifiex/txrx.c +90 mwifiex_process_tx(24)
  error: potential null derefence 'local_tx_pd'.
drivers/net/wireless/mwifiex/sta_ioctl.c +766
mwifiex_rate_ioctl_set_rate_value(30)
  error: buffer overflow 'rate' 14 <= 14

Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 7 insertions, 2 deletions

diff --git a/drivers/net/wireless/mwifiex/main.c b/drivers/net/wireless/mwifiex/main.c
index 848645118ad4..277ea84a05f5 100644
--- a/drivers/net/wireless/mwifiex/main.c
+++ b/drivers/net/wireless/mwifiex/main.c
@@ -825,6 +825,10 @@ int mwifiex_remove_card(struct mwifiex_adapter *adapter, struct semaphore *sem)
                 rtnl_unlock();
         }
 
+        priv = adapter->priv[0];
+        if (!priv)
+                goto exit_remove;
+
         wiphy_unregister(priv->wdev->wiphy);
         wiphy_free(priv->wdev->wiphy);
         kfree(priv->wdev);
diff --git a/drivers/net/wireless/mwifiex/sta_ioctl.c b/drivers/net/wireless/mwifiex/sta_ioctl.c
index 520800b618e7..f20550a7c525 100644
--- a/drivers/net/wireless/mwifiex/sta_ioctl.c
+++ b/drivers/net/wireless/mwifiex/sta_ioctl.c
@@ -763,7 +763,7 @@ static int mwifiex_rate_ioctl_set_rate_value(struct mwifiex_private *priv,
                         if ((rate[i] & 0x7f) == (rate_cfg->rate & 0x7f))
                                 break;
                 }
-                if (!rate[i] || (i == MWIFIEX_SUPPORTED_RATES)) {
+                if ((i == MWIFIEX_SUPPORTED_RATES) || !rate[i]) {
                         dev_err(adapter->dev, "fixed data rate %#x is out "
                                "of range\n", rate_cfg->rate);
                         return -1;
diff --git a/drivers/net/wireless/mwifiex/txrx.c b/drivers/net/wireless/mwifiex/txrx.c
index 6190b2fa57a3..5d95c4b55a1f 100644
--- a/drivers/net/wireless/mwifiex/txrx.c
+++ b/drivers/net/wireless/mwifiex/txrx.c
@@ -87,7 +87,8 @@ int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb,
                         (adapter->pps_uapsd_mode) &&
                         (adapter->tx_lock_flag)) {
                                 priv->adapter->tx_lock_flag = false;
-                                local_tx_pd->flags = 0;
+                                if (local_tx_pd)
+                                        local_tx_pd->flags = 0;
                 }
                 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
                 break;