wifi: rtw89: avoid NULL dereference when RX problematic packet on unsupported 6 GHz band

With a quite rare chance, RX report might be problematic to make SW think
a packet is received on 6 GHz band even if the chip does not support 6 GHz
band actually. Since SW won't initialize stuffs for unsupported bands, NULL
dereference will happen then in the sequence, rtw89_vif_rx_stats_iter() ->
rtw89_core_cancel_6ghz_probe_tx(). So, add a check to avoid it.

The following is a crash log for this case.

 BUG: kernel NULL pointer dereference, address: 0000000000000032
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 0 P4D 0
 Oops: 0000 [#1] PREEMPT SMP NOPTI
 CPU: 1 PID: 1907 Comm: irq/131-rtw89_p Tainted: G     U             6.6.56-05896-g89f5fb0eb30b #1 (HASH:1400 4)
 Hardware name: Google Telith/Telith, BIOS Google_Telith.15217.747.0 11/12/2024
 RIP: 0010:rtw89_vif_rx_stats_iter+0xd2/0x310 [rtw89_core]
 Code: 4c 89 7d c8 48 89 55 c0 49 8d 44 24 02 48 89 45 b8 45 31 ff eb 11
 41 c6 45 3a 01 41 b7 01 4d 8b 6d 00 4d 39 f5 74 42 8b 43 10 <41> 33 45
 32 0f b7 4b 14 66 41 33 4d 36 0f b7 c9 09 c1 74 d8 4d 85
 RSP: 0018:ffff9f3080138ca0 EFLAGS: 00010246
 RAX: 00000000b8bf5770 RBX: ffff91b5e8c639c0 RCX: 0000000000000011
 RDX: ffff91b582de1be8 RSI: 0000000000000000 RDI: ffff91b5e8c639e6
 RBP: ffff9f3080138d00 R08: 0000000000000000 R09: 0000000000000000
 R10: ffff91b59de70000 R11: ffffffffc069be50 R12: ffff91b5e8c639e4
 R13: 0000000000000000 R14: ffff91b5828020b8 R15: 0000000000000000
 FS:  0000000000000000(0000) GS:ffff91b8efa40000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000000000000032 CR3: 00000002bf838000 CR4: 0000000000750ee0
 PKRU: 55555554
 Call Trace:
  <IRQ>
  ? __die_body+0x68/0xb0
  ? page_fault_oops+0x379/0x3e0
  ? exc_page_fault+0x4f/0xa0
  ? asm_exc_page_fault+0x22/0x30
  ? __pfx_rtw89_vif_rx_stats_iter+0x10/0x10 [rtw89_core (HASH:1400 5)]
  ? rtw89_vif_rx_stats_iter+0xd2/0x310 [rtw89_core (HASH:1400 5)]
  __iterate_interfaces+0x59/0x110 [mac80211 (HASH:1400 6)]
  ? __pfx_rtw89_vif_rx_stats_iter+0x10/0x10 [rtw89_core (HASH:1400 5)]
  ? __pfx_rtw89_vif_rx_stats_iter+0x10/0x10 [rtw89_core (HASH:1400 5)]
  ieee80211_iterate_active_interfaces_atomic+0x36/0x50 [mac80211 (HASH:1400 6)]
  rtw89_core_rx_to_mac80211+0xfd/0x1b0 [rtw89_core (HASH:1400 5)]
  rtw89_core_rx+0x43a/0x980 [rtw89_core (HASH:1400 5)]

Fixes: c6aa9a9 ("wifi: rtw89: add RNR support for 6 GHz scan")
Signed-off-by: Zong-Zhe Yang <[email protected]>
Signed-off-by: Ping-Ke Shih <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: Zong-Zhe Yang

drivers/net/wireless/realtek/rtw89/core.c

@@ -2161,6 +2161,11 @@ static void rtw89_core_cancel_6ghz_probe_tx(struct rtw89_dev *rtwdev,
 	if (rx_status->band != NL80211_BAND_6GHZ)
 		return;
 
+	if (unlikely(!(rtwdev->chip->support_bands & BIT(NL80211_BAND_6GHZ)))) {
+		rtw89_debug(rtwdev, RTW89_DBG_UNEXP, "invalid rx on unsupported 6 GHz\n");
+		return;
+	}
+
 	ssid_ie = cfg80211_find_ie(WLAN_EID_SSID, ies, skb->len);
 
 	list_for_each_entry(info, &pkt_list[NL80211_BAND_6GHZ], list) {