From: Johannes Berg <johannes.berg@xxxxxxxxx>
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@xxxxxxxxx>
---
net/mac80211/ieee80211_i.h | 3 +--
net/mac80211/mlme.c | 10 +++-------
net/mac80211/util.c | 7 +++++--
3 files changed, 9 insertions(+), 11 deletions(-)
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index d1a7c58..a906cc0 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1130,7 +1130,7 @@ 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 */
@@ -1156,7 +1156,6 @@ 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;
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 5eef6bd..d963017 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -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);
- }
}
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 99e4258..7dff94e 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -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) {
--
1.7.10.4
--
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