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>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index 2197aee2bb72..a8ac42c96d71 100644
--- 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(struct ath_softc *sc,
         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;
         }