diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2014-02-07 00:42:42 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-07 21:19:30 +0400 |
| commit | 7a081ea20e043f243b6fb9d50448cbe757fbb860 (patch) | |
| tree | 61ac41d402613b3246d01fe5fefbeb9acd5f5214 /drivers/staging | |
| parent | d3a874e899b073496d1fe89b6a2d1aa50870874d (diff) | |
| download | linux-7a081ea20e043f243b6fb9d50448cbe757fbb860.tar.xz | |
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>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/rtl8188eu/core/rtw_wlan_util.c | 22 |
1 files changed, 8 insertions, 14 deletions
diff --git a/drivers/staging/rtl8188eu/core/rtw_wlan_util.c b/drivers/staging/rtl8188eu/core/rtw_wlan_util.c index 153ec61493ab..96df62f95b6b 100644 --- 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, |