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Staging: rtl8723bs: rtw_wlan_util: Add size check of SSID IE

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Add size check of SSID information element in incoming 802.11
frames, to prevent memcpy() of IE in array bssid->Ssid.Ssid, with
size more than 32 bytes.

Signed-off-by: Denis Straghkov <d.straghkov@ispras.ru>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20200421212525.24962-1-d.straghkov@ispras.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Denis Straghkov 2020-04-22 00:25:25 +03:00 committed by Greg Kroah-Hartman
parent 1bc355cff2
commit 370730894b
1 changed files with 8 additions and 14 deletions
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22
drivers/staging/rtl8723bs/core/rtw_wlan_util.c
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@ -1271,13 +1271,13 @@ 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;
struct mlme_priv *pmlmepriv = &Adapter->mlmepriv;
int ssid_len;
if (is_client_associated_to_ap(Adapter) == false)
return true;
@ -1370,21 +1370,15 @@ 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) {
DBG_871X("%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,