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mac80211: use blacklist for duplicate IE check 

Instead of the current whitelist which accepts duplicates
only for the quiet and vendor IEs, use a blacklist of all
IEs (that we currently parse) that can't be duplicated.

This avoids detecting a beacon as corrupt in the future
when new IEs are added that can be duplicated.

Cc: stable@vger.kernel.org
Signed-off-by: Paul Stewart <pstew@chromium.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2012-10-24 14:19:53 +02:00
Родитель 279f0f5524
Коммит 9690fb169b
1 изменённых файлов: 35 добавлений и 7 удалений
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34
net/mac80211/util.c
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@ -643,14 +643,42 @@ u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
break;
}
if (id != WLAN_EID_VENDOR_SPECIFIC &&
id != WLAN_EID_QUIET &&
test_bit(id, seen_elems)) {
switch (id) {
case WLAN_EID_SSID:
case WLAN_EID_SUPP_RATES:
case WLAN_EID_FH_PARAMS:
case WLAN_EID_DS_PARAMS:
case WLAN_EID_CF_PARAMS:
case WLAN_EID_TIM:
case WLAN_EID_IBSS_PARAMS:
case WLAN_EID_CHALLENGE:
case WLAN_EID_RSN:
case WLAN_EID_ERP_INFO:
case WLAN_EID_EXT_SUPP_RATES:
case WLAN_EID_HT_CAPABILITY:
case WLAN_EID_HT_OPERATION:
case WLAN_EID_VHT_CAPABILITY:
case WLAN_EID_VHT_OPERATION:
case WLAN_EID_MESH_ID:
case WLAN_EID_MESH_CONFIG:
case WLAN_EID_PEER_MGMT:
case WLAN_EID_PREQ:
case WLAN_EID_PREP:
case WLAN_EID_PERR:
case WLAN_EID_RANN:
case WLAN_EID_CHANNEL_SWITCH:
case WLAN_EID_EXT_CHANSWITCH_ANN:
case WLAN_EID_COUNTRY:
case WLAN_EID_PWR_CONSTRAINT:
case WLAN_EID_TIMEOUT_INTERVAL:
if (test_bit(id, seen_elems)) {
elems->parse_error = true;
left -= elen;
pos += elen;
continue;
}
break;
}
if (calc_crc && id < 64 && (filter & (1ULL << id)))
crc = crc32_be(crc, pos - 2, elen + 2);