mac80211: drop frames for sta with no valid rate

[deliverable/linux.git] / net / mac80211 / tx.c

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 60ae086995b11fe8e4dfc153bd939f89b785a144..f3efd4f16e91968aa32c6d2b7b52a1c6cd9cc39a 100644 (file)
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -512,6 +512,7 @@ ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
        int i, len;
        bool inval = false, rts = false, short_preamble = false;
        struct ieee80211_tx_rate_control txrc;
+       u32 sta_flags;
 
        memset(&txrc, 0, sizeof(txrc));
 
@@ -544,7 +545,26 @@ ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
             (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
                txrc.short_preamble = short_preamble = true;
 
+       sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
+
+       /*
+        * Lets not bother rate control if we're associated and cannot
+        * talk to the sta. This should not happen.
+        */
+       if (WARN((tx->local->sw_scanning) &&
+                (sta_flags & WLAN_STA_ASSOC) &&
+                !rate_usable_index_exists(sband, &tx->sta->sta),
+                "%s: Dropped data frame as no usable bitrate found while "
+                "scanning and associated. Target station: "
+                "%pM on %d GHz band\n",
+                tx->dev->name, hdr->addr1,
+                tx->channel->band ? 5 : 2))
+               return TX_DROP;
 
+       /*
+        * If we're associated with the sta at this point we know we can at
+        * least send the frame at the lowest bit rate.
+        */
        rate_control_get_rate(tx->sdata, tx->sta, &txrc);
 
        if (unlikely(info->control.rates[0].idx < 0))