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   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Tue, 12 Feb 2019 14:22:43 +0100
   3 Subject: [PATCH] wpa_supplicant: fix race condition in mesh mpm new peer
   4  handling
   5
   6 When wpa_supplicant receives another new peer event before the first one
   7 has been processed, it tries to add a station to the driver a second time
   8 (which fails) and then tears down the station entry until another event
   9 comes in.
  10 Fix this by only adding a station to the driver if it didn't exist already.
  11
  12 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  13 ---
  14
  15 --- a/wpa_supplicant/mesh_mpm.c
  16 +++ b/wpa_supplicant/mesh_mpm.c
  17 @@ -663,11 +663,12 @@ static struct sta_info * mesh_mpm_add_pe
  18         }
  19
  20         sta = ap_get_sta(data, addr);
  21 -       if (!sta) {
  22 -               sta = ap_sta_add(data, addr);
  23 -               if (!sta)
  24 -                       return NULL;
  25 -       }
  26 +       if (sta)
  27 +               return sta;
  28 +
  29 +       sta = ap_sta_add(data, addr);
  30 +       if (!sta)
  31 +               return NULL;
  32
  33         /* Set WMM by default since Mesh STAs are QoS STAs */
  34         sta->flags |= WLAN_STA_WMM;