wifi: rtw88: validate RX rate to prevent out-of-bound

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.

Tested on HP Notebook P3S95EA#ACB (kernel 6.19.9-1-cachyos):

  - No WARNING: net/mac80211/rx.c:5491 observed after patch.
  - System remains fully stable through idle, load, Bluetooth A2DP
    usage, and multiple suspend/resume cycles.
  - Zero H2C or LPS errors in dmesg.

Reported-by: Oleksandr Havrylov <goainwo@gmail.com>
Closes: https://lore.kernel.org/linux-wireless/CALdGYqSMUPnPfW-_q1RgYr0_SjoXUejAaJJr-o+jpwCk1S7ndQ@mail.gmail.com/
Tested-by: Oleksandr Havrylov <goainwo@gmail.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>

Author: Ping-Ke Shih

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 (unlikely(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;