staging: rtl8712: fix potential leak in r871x_wx_set_enc_ext()

Fix a potential leak in the error path of r871x_wx_set_enc_ext(). In case the
requested algorithm is not supported by the driver, the function returns
without freeing the already allocated 'param' struct. Move the input
verification to the beginning of the function so that the direct return is
safe. Detected by Coverity - CID 144373.

Signed-off-by: Christian Engelmayer <cengelma@gmx.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/rtl8712/rtl871x_ioctl_linux.c b/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
index 23d539dba7eff213394347d5a41a2bfd15c6fdd6..1eca992ce0661535b7d7831549eb91988b953992 100644 (file)
--- a/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
+++ b/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
@@ -1801,13 +1801,6 @@ static int r871x_wx_set_enc_ext(struct net_device *dev,
        u32 param_len;
        int ret = 0;
 
-       param_len = sizeof(struct ieee_param) + pext->key_len;
-       param = (struct ieee_param *)_malloc(param_len);
-       if (param == NULL)
-               return -ENOMEM;
-       memset(param, 0, param_len);
-       param->cmd = IEEE_CMD_SET_ENCRYPTION;
-       memset(param->sta_addr, 0xff, ETH_ALEN);
        switch (pext->alg) {
        case IW_ENCODE_ALG_NONE:
                alg_name = "none";
@@ -1824,6 +1817,15 @@ static int r871x_wx_set_enc_ext(struct net_device *dev,
        default:
                return -EINVAL;
        }
+
+       param_len = sizeof(struct ieee_param) + pext->key_len;
+       param = (struct ieee_param *)_malloc(param_len);
+       if (param == NULL)
+               return -ENOMEM;
+       memset(param, 0, param_len);
+       param->cmd = IEEE_CMD_SET_ENCRYPTION;
+       memset(param->sta_addr, 0xff, ETH_ALEN);
+
        strncpy((char *)param->u.crypt.alg, alg_name, IEEE_CRYPT_ALG_NAME_LEN);
        if (pext->ext_flags & IW_ENCODE_EXT_GROUP_KEY)
                param->u.crypt.set_tx = 0;