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staging: r8188eu: memory corruption handling long ssids

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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>
This commit is contained in:
Dan Carpenter 2014-02-06 23:42:42 +03:00 committed by Greg Kroah-Hartman
parent d3a874e899
commit 7a081ea20e
1 changed files with 8 additions and 14 deletions
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22
drivers/staging/rtl8188eu/core/rtw_wlan_util.c
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@ -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,