mwifiex: correct histogram data with appropriate index

Correct snr/nr/rssi data index to avoid possible buffer underflow.

Signed-off-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/marvell/mwifiex/util.c b/drivers/net/wireless/marvell/mwifiex/util.c
index 0cd68ff..51ccf10 100644 (file)
--- a/drivers/net/wireless/marvell/mwifiex/util.c
+++ b/drivers/net/wireless/marvell/mwifiex/util.c
@@ -708,12 +708,14 @@ void mwifiex_hist_data_set(struct mwifiex_private *priv, u8 rx_rate, s8 snr,
                           s8 nflr)
 {
        struct mwifiex_histogram_data *phist_data = priv->hist_data;
+       s8 nf   = -nflr;
+       s8 rssi = snr - nflr;
 
        atomic_inc(&phist_data->num_samples);
        atomic_inc(&phist_data->rx_rate[rx_rate]);
-       atomic_inc(&phist_data->snr[snr]);
-       atomic_inc(&phist_data->noise_flr[128 + nflr]);
-       atomic_inc(&phist_data->sig_str[nflr - snr]);
+       atomic_inc(&phist_data->snr[snr + 128]);
+       atomic_inc(&phist_data->noise_flr[nf + 128]);
+       atomic_inc(&phist_data->sig_str[rssi + 128]);
 }
 
 /* function to reset histogram data during init/reset */