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authorJohannes Berg <johannes.berg@intel.com>2012-09-05 13:07:00 +0200
committerJohannes Berg <johannes.berg@intel.com>2012-09-06 17:11:00 +0200
commit761a48d2603c0ff48024bc70c129b00ec37639ed (patch)
treea445a44200d62a5304335dd31be3e3d9a44289f1 /net/mac80211
parentf8fffc7e51462f51ffca6d0df505ef16afee2fb6 (diff)
mac80211: check power constraint IE size when parsing
The power constraint IE is always a single byte so check the size when parsing instead of later. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/ieee80211_i.h1
-rw-r--r--net/mac80211/mlme.c10
-rw-r--r--net/mac80211/util.c5
3 files changed, 6 insertions, 10 deletions
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index e2ab03c773e3..b95fa256d438 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1165,7 +1165,6 @@ struct ieee802_11_elems {
u8 prep_len;
u8 perr_len;
u8 country_elem_len;
- u8 pwr_constr_elem_len;
u8 quiet_elem_len;
u8 num_of_quiet_elem; /* can be more the one */
u8 timeout_int_len;
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 6e374cb04af6..87466942fa82 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -821,18 +821,13 @@ void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
}
static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
- u16 capab_info, u8 *pwr_constr_elem,
- u8 pwr_constr_elem_len)
+ u16 capab_info, u8 *pwr_constr_elem)
{
struct ieee80211_conf *conf = &sdata->local->hw.conf;
if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
return;
- /* Power constraint IE length should be 1 octet */
- if (pwr_constr_elem_len != 1)
- return;
-
if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
(*pwr_constr_elem != sdata->local->power_constr_level)) {
sdata->local->power_constr_level = *pwr_constr_elem;
@@ -2552,8 +2547,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
if (elems.pwr_constr_elem)
ieee80211_handle_pwr_constr(sdata,
le16_to_cpu(mgmt->u.probe_resp.capab_info),
- elems.pwr_constr_elem,
- elems.pwr_constr_elem_len);
+ elems.pwr_constr_elem);
}
ieee80211_bss_info_change_notify(sdata, changed);
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 471fb0516c99..ed7543960b16 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -792,8 +792,11 @@ u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
elems->country_elem_len = elen;
break;
case WLAN_EID_PWR_CONSTRAINT:
+ if (elen != 1) {
+ elem_parse_failed = true;
+ break;
+ }
elems->pwr_constr_elem = pos;
- elems->pwr_constr_elem_len = elen;
break;
case WLAN_EID_TIMEOUT_INTERVAL:
elems->timeout_int = pos;