OpenWrt – Rev 4

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From: Felix Fietkau <nbd@nbd.name>
Date: Wed, 17 Jan 2018 11:11:17 +0100
Subject: [PATCH] ath9k: discard undersized packets

Sometimes the hardware will push small packets that trigger a WARN_ON
in mac80211. Discard them early to avoid this issue.

Reported-by: Stijn Tintel <stijn@linux-ipv6.be>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -826,9 +826,9 @@ static int ath9k_rx_skb_preprocess(struc
        sc->rx.discard_next = false;
 
        /*
-        * Discard zero-length packets.
+        * Discard zero-length packets and packets smaller than an ACK
         */
-       if (!rx_stats->rs_datalen) {
+       if (rx_stats->rs_datalen < 10) {
                RX_STAT_INC(rx_len_err);
                goto corrupt;
        }