[PATCH AUTOSEL 4.4 14/92] mwifiex: prevent an array overflow

From: Dan Carpenter <redacted>

[ Upstream commit b4c35c17227fe437ded17ce683a6927845f8c4a4 ]

The "rate_index" is only used as an index into the phist_data->rx_rate[]
array in the mwifiex_hist_data_set() function.  That array has
MWIFIEX_MAX_AC_RX_RATES (74) elements and it's used to generate some
debugfs information.  The "rate_index" variable comes from the network
skb->data[] and it is a u8 so it's in the 0-255 range.  We need to cap
it to prevent an array overflow.

Fixes: cbf6e05527a7 ("mwifiex: add rx histogram statistics support")
Signed-off-by: Dan Carpenter <redacted>
Signed-off-by: Kalle Valo <redacted>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/wireless/mwifiex/cfp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/mwifiex/cfp.c b/drivers/net/wireless/mwifiex/cfp.c
index 3ddb8ec676ed3..6dd331dfb5179 100644
--- a/drivers/net/wireless/mwifiex/cfp.c
+++ b/drivers/net/wireless/mwifiex/cfp.c

@@ -533,5 +533,8 @@ u8 mwifiex_adjust_data_rate(struct mwifiex_private *priv,
 		rate_index = (rx_rate > MWIFIEX_RATE_INDEX_OFDM0) ?
 			      rx_rate - 1 : rx_rate;
 
+	if (rate_index >= MWIFIEX_MAX_AC_RX_RATES)
+		rate_index = MWIFIEX_MAX_AC_RX_RATES - 1;
+
 	return rate_index;
 }

-- 
2.20.1