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   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Fri, 7 Oct 2022 10:58:26 +0200
   3 Subject: [PATCH] wifi: mac80211: do not drop packets smaller than the
   4  LLC-SNAP header on fast-rx
   5
   6 Since STP TCN frames are only 7 bytes, the pskb_may_pull call returns an error.
   7 Instead of dropping those packets, bump them back to the slow path for proper
   8 processing.
   9
  10 Fixes: 49ddf8e6e234 ("mac80211: add fast-rx path")
  11 Reported-by: Chad Monroe <chad.monroe@smartrg.com>
  12 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  13 ---
  14
  15 --- a/net/mac80211/rx.c
  16 +++ b/net/mac80211/rx.c
  17 @@ -4603,7 +4603,7 @@ static bool ieee80211_invoke_fast_rx(str
  18
  19         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
  20                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
  21 -                       goto drop;
  22 +                       return false;
  23
  24                 payload = (void *)(skb->data + snap_offs);
  25