staging: r8188eu: memory corruption handling long ssids

We should cap the SSID length at NDIS_802_11_LENGTH_SSID (32) characters
to avoid memory corruption.  If the SSID is too long then I have opted
to ignore it instead of truncating it.

We don't need to clear bssid->Ssid.Ssid[0] because this struct is
allocated with rtw_zmalloc()

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/rtl8188eu/core/rtw_wlan_util.c b/drivers/staging/rtl8188eu/core/rtw_wlan_util.c
index 153ec61..96df62f 100644 (file)
--- a/drivers/staging/rtl8188eu/core/rtw_wlan_util.c
+++ b/drivers/staging/rtl8188eu/core/rtw_wlan_util.c
@@ -912,12 +912,12 @@ int rtw_check_bcn_info(struct adapter  *Adapter, u8 *pframe, u32 packet_len)
        unsigned char *pbuf;
        u32 wpa_ielen = 0;
        u8 *pbssid = GetAddr3Ptr(pframe);
-       u32 hidden_ssid = 0;
        struct HT_info_element *pht_info = NULL;
        struct rtw_ieee80211_ht_cap *pht_cap = NULL;
        u32 bcn_channel;
        unsigned short  ht_cap_info;
        unsigned char   ht_info_infos_0;
+       int ssid_len;
 
        if (is_client_associated_to_ap(Adapter) == false)
                return true;
@@ -999,21 +999,15 @@ int rtw_check_bcn_info(struct adapter  *Adapter, u8 *pframe, u32 packet_len)
        }
 
        /* checking SSID */
+       ssid_len = 0;
        p = rtw_get_ie(bssid->IEs + _FIXED_IE_LENGTH_, _SSID_IE_, &len, bssid->IELength - _FIXED_IE_LENGTH_);
-       if (p == NULL) {
-               DBG_88E("%s marc: cannot find SSID for survey event\n", __func__);
-               hidden_ssid = true;
-       } else {
-               hidden_ssid = false;
-       }
-
-       if ((NULL != p) && (false == hidden_ssid && (*(p + 1)))) {
-               memcpy(bssid->Ssid.Ssid, (p + 2), *(p + 1));
-               bssid->Ssid.SsidLength = *(p + 1);
-       } else {
-               bssid->Ssid.SsidLength = 0;
-               bssid->Ssid.Ssid[0] = '\0';
+       if (p) {
+               ssid_len = *(p + 1);
+               if (ssid_len > NDIS_802_11_LENGTH_SSID)
+                       ssid_len = 0;
        }
+       memcpy(bssid->Ssid.Ssid, (p + 2), ssid_len);
+       bssid->Ssid.SsidLength = ssid_len;
 
        RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s bssid.Ssid.Ssid:%s bssid.Ssid.SsidLength:%d "
                                "cur_network->network.Ssid.Ssid:%s len:%d\n", __func__, bssid->Ssid.Ssid,