[PATCH rtw-next] wifi: rtw88: validate RX rate to prevent out-of-bound

[Ping-Ke Shih <pkshih@realtek.com>]

The reported RX rate might be unexpected, causing kernel warns:

  Rate marked as a VHT rate but data is invalid: MCS: 0, NSS: 0
  WARNING: net/mac80211/rx.c:5491 at ieee80211_rx_list+0x183/0x1020 [mac80211]

As the RX rate can be index of an array under certain conditions, validate
it to prevent accessing array out-of-bound potentially.

Reported-by: Oleksandr Havrylov <goainwo@gmail.com>
Closes: https://lore.kernel.org/linux-wireless/CALdGYqSMUPnPfW-_q1RgYr0_SjoXUejAaJJr-o+jpwCk1S7ndQ@mail.gmail.com/
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
---
 drivers/net/wireless/realtek/rtw88/rx.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/wireless/realtek/rtw88/rx.c b/drivers/net/wireless/realtek/rtw88/rx.c
index 8b0afaaffaa0..41f6557d8d78 100644
--- a/drivers/net/wireless/realtek/rtw88/rx.c
+++ b/drivers/net/wireless/realtek/rtw88/rx.c
@@ -295,6 +295,14 @@ void rtw_rx_query_rx_desc(struct rtw_dev *rtwdev, void *rx_desc8,
 
 	pkt_stat->tsf_low = le32_get_bits(rx_desc->w5, RTW_RX_DESC_W5_TSFL);
 
+	if (pkt_stat->rate >= DESC_RATE_MAX) {
+		rtw_dbg(rtwdev, RTW_DBG_UNEXP,
+			"unexpected RX rate=0x%x\n", pkt_stat->rate);
+
+		pkt_stat->rate = DESC_RATE1M;
+		pkt_stat->bw = RTW_CHANNEL_WIDTH_20;
+	}
+
 	/* drv_info_sz is in unit of 8-bytes */
 	pkt_stat->drv_info_sz *= 8;
 

base-commit: eef6d4449e8a540fde792968a26d8aa514af8089
-- 
2.25.1