ath10k: Fix TKIP Michael MIC verification for PCIe

TKIP Michael MIC was not verified properly for PCIe cases since the
validation steps in ieee80211_rx_h_michael_mic_verify() in mac80211 did
not get fully executed due to unexpected flag values in
ieee80211_rx_status.

Fix this by setting the flags property to meet mac80211 expectations for
performing Michael MIC validation there. This fixes CVE-2020-26141. It
does the same as ath10k_htt_rx_proc_rx_ind_hl() for SDIO which passed
MIC verification case. This applies only to QCA6174/QCA9377 PCIe.

Tested-on: QCA6174 hw3.2 PCI WLAN.RM.4.4.1-00110-QCARMSWP-1

Cc: [email protected]
Signed-off-by: Wen Gong <[email protected]>
Signed-off-by: Jouni Malinen <[email protected]>
Link: https://lore.kernel.org/r/20210511200110.c3f1d42c6746.I795593fcaae941c471425b8c7d5f7bb185d29142@changeid
Signed-off-by: Johannes Berg <[email protected]>

Author: Wen Gong

drivers/net/wireless/ath/ath10k/htt_rx.c

@@ -1974,6 +1974,11 @@ static void ath10k_htt_rx_h_mpdu(struct ath10k *ar,
 		}
 
 		ath10k_htt_rx_h_csum_offload(msdu);
+
+		if (frag && !fill_crypt_header &&
+		    enctype == HTT_RX_MPDU_ENCRYPT_TKIP_WPA)
+			status->flag &= ~RX_FLAG_MMIC_STRIPPED;
+
 		ath10k_htt_rx_h_undecap(ar, msdu, status, first_hdr, enctype,
 					is_decrypted);
 
@@ -1991,6 +1996,11 @@ static void ath10k_htt_rx_h_mpdu(struct ath10k *ar,
 
 		hdr = (void *)msdu->data;
 		hdr->frame_control &= ~__cpu_to_le16(IEEE80211_FCTL_PROTECTED);
+
+		if (frag && !fill_crypt_header &&
+		    enctype == HTT_RX_MPDU_ENCRYPT_TKIP_WPA)
+			status->flag &= ~RX_FLAG_IV_STRIPPED &
+					~RX_FLAG_MMIC_STRIPPED;
 	}
 }