mac80211: check ERP info IE length in parser

It's always just one byte, so check for that and
remove the length field from the parser struct.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index eccd1d8..6ad019d 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1189,7 +1189,6 @@ struct ieee802_11_elems {
        u8 tim_len;
        u8 challenge_len;
        u8 rsn_len;
-       u8 erp_info_len;
        u8 ext_supp_rates_len;
        u8 wmm_info_len;
        u8 wmm_param_len;

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index f76c58f..157d951 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -3038,7 +3038,7 @@ ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
                changed |= BSS_CHANGED_DTIM_PERIOD;
        }
 
-       if (elems.erp_info && elems.erp_info_len >= 1) {
+       if (elems.erp_info) {
                erp_valid = true;
                erp_value = elems.erp_info[0];
        } else {

diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 581764f..33fbf10 100644 (file)
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -98,9 +98,8 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
        }
 
        /* save the ERP value so that it is available at association time */
-       if (elems->erp_info && elems->erp_info_len >= 1 &&
-                       (!elems->parse_error ||
-                        !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
+       if (elems->erp_info && (!elems->parse_error ||
+                               !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
                bss->erp_value = elems->erp_info[0];
                bss->has_erp_value = true;
                if (!elems->parse_error)

diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 0f7d1c2..4839dec 100644 (file)
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -780,8 +780,10 @@ u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
                        elems->rsn_len = elen;
                        break;
                case WLAN_EID_ERP_INFO:
-                       elems->erp_info = pos;
-                       elems->erp_info_len = elen;
+                       if (elen >= 1)
+                               elems->erp_info = pos;
+                       else
+                               elem_parse_failed = true;
                        break;
                case WLAN_EID_EXT_SUPP_RATES:
                        elems->ext_supp_rates = pos;