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mac80211: check size of channel switch IE when parsing 

The channel switch IE has a fixed size, so we can
discard it in parsing if it's not the right size
and use the right struct pointer.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2012-08-01 16:13:02 +02:00
parent 3049000b97
commit 5bc1420b11
3 changed files with 9 additions and 11 deletions
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3
net/mac80211/ieee80211_i.h
View File

@ -1136,7 +1136,7 @@ struct ieee802_11_elems {
u8 *prep;
u8 *perr;
struct ieee80211_rann_ie *rann;
u8 *ch_switch_elem;
struct ieee80211_channel_sw_ie *ch_switch_ie;
u8 *country_elem;
u8 *pwr_constr_elem;
u8 *quiet_elem; /* first quite element */
@ -1162,7 +1162,6 @@ struct ieee802_11_elems {
u8 preq_len;
u8 prep_len;
u8 perr_len;
u8 ch_switch_elem_len;
u8 country_elem_len;
u8 pwr_constr_elem_len;
u8 quiet_elem_len;

10
net/mac80211/mlme.c
View File

@ -2267,14 +2267,10 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
mutex_unlock(&local->iflist_mtx);
}
if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
(memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
ETH_ALEN) == 0)) {
struct ieee80211_channel_sw_ie *sw_elem =
(struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
ieee80211_sta_process_chanswitch(sdata, sw_elem,
if (elems->ch_switch_ie &&
memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
bss, rx_status->mactime);
}
}

7
net/mac80211/util.c
View File

@ -768,8 +768,11 @@ u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
elem_parse_failed = true;
break;
case WLAN_EID_CHANNEL_SWITCH:
elems->ch_switch_elem = pos;
elems->ch_switch_elem_len = elen;
if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
elem_parse_failed = true;
break;
}
elems->ch_switch_ie = (void *)pos;
break;
case WLAN_EID_QUIET:
if (!elems->quiet_elem) {