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

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>