git.librecmc.org Git - oweals/openwrt.git/blob

   1 From: Dan Carpenter <dan.carpenter@oracle.com>
   2 Date: Tue, 26 Nov 2019 15:09:39 +0300
   3 Subject: [PATCH] mac80211: airtime: Fix an off by one in
   4  ieee80211_calc_rx_airtime()
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 This code was copied from mt76 and inherited an off by one bug from
  10 there.  The > should be >= so that we don't read one element beyond
  11 the end of the array.
  12
  13 Fixes: db3e1c40cf2f ("mac80211: Import airtime calculation code from mt76")
  14 Reported-by: Toke Høiland-Jørgensen <toke@redhat.com>
  15 Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
  16 Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
  17 Link: https://lore.kernel.org/r/20191126120910.ftr4t7me3by32aiz@kili.mountain
  18 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  19 ---
  20
  21 --- a/net/mac80211/airtime.c
  22 +++ b/net/mac80211/airtime.c
  23 @@ -442,7 +442,7 @@ u32 ieee80211_calc_rx_airtime(struct iee
  24                         return 0;
  25
  26                 sband = hw->wiphy->bands[status->band];
  27 -               if (!sband || status->rate_idx > sband->n_bitrates)
  28 +               if (!sband || status->rate_idx >= sband->n_bitrates)
  29                         return 0;
  30
  31                 rate = &sband->bitrates[status->rate_idx];