mac80211: check DSSS params 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>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 2708b270e944..0f7d1c20f8ac 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -739,8 +739,10 @@ u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
                         elems->supp_rates_len = elen;
                         break;
                 case WLAN_EID_DS_PARAMS:
-                        elems->ds_params = pos;
-                        elems->ds_params_len = elen;
+                        if (elen >= 1)
+                                elems->ds_params = pos;
+                        else
+                                elem_parse_failed = true;
                         break;
                 case WLAN_EID_TIM:
                         if (elen >= sizeof(struct ieee80211_tim_ie)) {