diff options
| author | Johannes Berg | 2008-10-07 19:31:17 +0200 |
|---|---|---|
| committer | John W. Linville | 2008-10-14 20:47:15 -0400 |
| commit | 09914813da37f1ee9d77998a0701629cfbbd98f4 (patch) | |
| tree | 6577e7769862378abf62e6867a54b71da1dc12c6 | |
| parent | 3eadd751eb8cb8090a65b4fa72c6360fd1aa5f06 (diff) | |
mac80211: fix HT information element parsing
There's no checking that the HT IEs are of the right length
which can be used by an attacker to cause an out-of-bounds
access by sending a too short HT information/capability IE.
Fix it by simply pretending those IEs didn't exist when too
short.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
| -rw-r--r-- | net/mac80211/ieee80211_i.h | 6 | ||||
| -rw-r--r-- | net/mac80211/mlme.c | 3 | ||||
| -rw-r--r-- | net/mac80211/util.c | 8 |
3 files changed, 6 insertions, 11 deletions
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 8025b294588b..156e42a003ae 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -816,8 +816,8 @@ struct ieee802_11_elems { u8 *ext_supp_rates; u8 *wmm_info; u8 *wmm_param; - u8 *ht_cap_elem; - u8 *ht_info_elem; + struct ieee80211_ht_cap *ht_cap_elem; + struct ieee80211_ht_addt_info *ht_info_elem; u8 *mesh_config; u8 *mesh_id; u8 *peer_link; @@ -844,8 +844,6 @@ struct ieee802_11_elems { u8 ext_supp_rates_len; u8 wmm_info_len; u8 wmm_param_len; - u8 ht_cap_elem_len; - u8 ht_info_elem_len; u8 mesh_config_len; u8 mesh_id_len; u8 peer_link_len; diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 49f86fa56bff..87665d7bb4f9 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -1348,10 +1348,8 @@ static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) { struct ieee80211_ht_bss_info bss_info; ieee80211_ht_cap_ie_to_ht_info( - (struct ieee80211_ht_cap *) elems.ht_cap_elem, &sta->sta.ht_info); ieee80211_ht_addt_info_ie_to_ht_bss_info( - (struct ieee80211_ht_addt_info *) elems.ht_info_elem, &bss_info); ieee80211_handle_ht(local, 1, &sta->sta.ht_info, &bss_info); } @@ -1709,7 +1707,6 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, struct ieee80211_ht_bss_info bss_info; ieee80211_ht_addt_info_ie_to_ht_bss_info( - (struct ieee80211_ht_addt_info *) elems.ht_info_elem, &bss_info); changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf, &bss_info); diff --git a/net/mac80211/util.c b/net/mac80211/util.c index f32561ec224c..cee4884b9d06 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -529,12 +529,12 @@ void ieee802_11_parse_elems(u8 *start, size_t len, elems->ext_supp_rates_len = elen; break; case WLAN_EID_HT_CAPABILITY: - elems->ht_cap_elem = pos; - elems->ht_cap_elem_len = elen; + if (elen >= sizeof(struct ieee80211_ht_cap)) + elems->ht_cap_elem = (void *)pos; break; case WLAN_EID_HT_EXTRA_INFO: - elems->ht_info_elem = pos; - elems->ht_info_elem_len = elen; + if (elen >= sizeof(struct ieee80211_ht_addt_info)) + elems->ht_info_elem = (void *)pos; break; case WLAN_EID_MESH_ID: elems->mesh_id = pos; |