rsi: Fix a potential memory leak in rsi_set_channel()

Fix a potential memory leak in function rsi_set_channel() that is used to
program channel changes. The channel check block for the frequency bands
directly exits the function in case of an error, thus leaving an already
allocated skb unreferenced. Move the checks above allocating the skb.
Detected by Coverity: CID 1195576.

Signed-off-by: Christian Engelmayer <cengelma@gmx.at>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/rsi/rsi_91x_mgmt.c b/drivers/net/wireless/rsi/rsi_91x_mgmt.c
index 73694295648f19988365b3866846af7929d63201..3a030b9d0fe6c48b9db3fc6a946bf1ccf56e428b 100644 (file)
--- a/drivers/net/wireless/rsi/rsi_91x_mgmt.c
+++ b/drivers/net/wireless/rsi/rsi_91x_mgmt.c
@@ -841,16 +841,6 @@ int rsi_set_channel(struct rsi_common *common, u16 channel)
        rsi_dbg(MGMT_TX_ZONE,
                "%s: Sending scan req frame\n", __func__);
 
-       skb = dev_alloc_skb(FRAME_DESC_SZ);
-       if (!skb) {
-               rsi_dbg(ERR_ZONE, "%s: Failed in allocation of skb\n",
-                       __func__);
-               return -ENOMEM;
-       }
-
-       memset(skb->data, 0, FRAME_DESC_SZ);
-       mgmt_frame = (struct rsi_mac_frame *)skb->data;
-
        if (common->band == IEEE80211_BAND_5GHZ) {
                if ((channel >= 36) && (channel <= 64))
                        channel = ((channel - 32) / 4);
@@ -868,6 +858,16 @@ int rsi_set_channel(struct rsi_common *common, u16 channel)
                }
        }
 
+       skb = dev_alloc_skb(FRAME_DESC_SZ);
+       if (!skb) {
+               rsi_dbg(ERR_ZONE, "%s: Failed in allocation of skb\n",
+                       __func__);
+               return -ENOMEM;
+       }
+
+       memset(skb->data, 0, FRAME_DESC_SZ);
+       mgmt_frame = (struct rsi_mac_frame *)skb->data;
+
        mgmt_frame->desc_word[0] = cpu_to_le16(RSI_WIFI_MGMT_Q << 12);
        mgmt_frame->desc_word[1] = cpu_to_le16(SCAN_REQUEST);
        mgmt_frame->desc_word[4] = cpu_to_le16(channel);