mwl8k: Fix rate_idx underflow

commit 6b583201fa219b7b1b6aebd8966c8fd9357ef9f4 upstream.

It was reported on OpenWrt bug tracking system[1], that several users
are affected by the endless reboot of their routers if they configure
5GHz interface with channel 44 or 48.

The reboot loop is caused by the following excessive number of WARN_ON
messages:

 WARNING: CPU: 0 PID: 0 at backports-4.19.23-1/net/mac80211/rx.c:4516
                             ieee80211_rx_napi+0x1fc/0xa54 [mac80211]

as the messages are being correctly emitted by the following guard:

 case RX_ENC_LEGACY:
      if (WARN_ON(status->rate_idx >= sband->n_bitrates))

as the rate_idx is in this case erroneously set to 251 (0xfb). This fix
simply converts previously used magic number to proper constant and
guards against substraction which is leading to the currently observed
underflow.

1. https://bugs.openwrt.org/index.php?do=details&task_id=2218

Fixes: 854783444bab ("mwl8k: properly set receive status rate index on 5 GHz receive")
Cc: <stable@vger.kernel.org>
Tested-by: Eubert Bao <bunnier@gmail.com>
Reported-by: Eubert Bao <bunnier@gmail.com>
Signed-off-by: Petr Štetiar <ynezz@true.cz>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/marvell/mwl8k.c b/drivers/net/wireless/marvell/mwl8k.c
index 8e4e9b6919e0274cbdbc3a2cfde72b2e40c8fb6f..ffc565ac21924b590481df8c88eefe422de4e463 100644 (file)
--- a/drivers/net/wireless/marvell/mwl8k.c
+++ b/drivers/net/wireless/marvell/mwl8k.c
@@ -441,6 +441,9 @@ static const struct ieee80211_rate mwl8k_rates_50[] = {
 #define MWL8K_CMD_UPDATE_STADB         0x1123
 #define MWL8K_CMD_BASTREAM             0x1125
 
+#define MWL8K_LEGACY_5G_RATE_OFFSET \
+       (ARRAY_SIZE(mwl8k_rates_24) - ARRAY_SIZE(mwl8k_rates_50))
+
 static const char *mwl8k_cmd_name(__le16 cmd, char *buf, int bufsize)
 {
        u16 command = le16_to_cpu(cmd);
@@ -1016,8 +1019,9 @@ mwl8k_rxd_ap_process(void *_rxd, struct ieee80211_rx_status *status,
 
        if (rxd->channel > 14) {
                status->band = NL80211_BAND_5GHZ;
-               if (!(status->encoding == RX_ENC_HT))
-                       status->rate_idx -= 5;
+               if (!(status->encoding == RX_ENC_HT) &&
+                   status->rate_idx >= MWL8K_LEGACY_5G_RATE_OFFSET)
+                       status->rate_idx -= MWL8K_LEGACY_5G_RATE_OFFSET;
        } else {
                status->band = NL80211_BAND_2GHZ;
        }
@@ -1124,8 +1128,9 @@ mwl8k_rxd_sta_process(void *_rxd, struct ieee80211_rx_status *status,
 
        if (rxd->channel > 14) {
                status->band = NL80211_BAND_5GHZ;
-               if (!(status->encoding == RX_ENC_HT))
-                       status->rate_idx -= 5;
+               if (!(status->encoding == RX_ENC_HT) &&
+                   status->rate_idx >= MWL8K_LEGACY_5G_RATE_OFFSET)
+                       status->rate_idx -= MWL8K_LEGACY_5G_RATE_OFFSET;
        } else {
                status->band = NL80211_BAND_2GHZ;
        }