ath10k: drop fragments with multicast DA for SDIO

Fragmentation is not used with multicast frames. Discard unexpected
fragments with multicast DA. This fixes CVE-2020-26145.

Tested-on: QCA6174 hw3.2 SDIO WLAN.RMH.4.4.1-00049

Cc: stable@vger.kernel.org
Signed-off-by: Wen Gong <wgong@codeaurora.org>
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
Link: https://lore.kernel.org/r/20210511200110.9ca6ca7945a9.I1e18b514590af17c155bda86699bc3a971a8dcf4@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c
index cb04848ed5cb6ee1f433e3b520174a27ca2a7fdd..b1d93ff5215a6bdd84516c5dcbe22780cebb3d2c 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/htt_rx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
@@ -2617,6 +2617,13 @@ static bool ath10k_htt_rx_proc_rx_frag_ind_hl(struct ath10k_htt *htt,
        rx_desc = (struct htt_hl_rx_desc *)(skb->data + tot_hdr_len);
        rx_desc_info = __le32_to_cpu(rx_desc->info);
 
+       hdr = (struct ieee80211_hdr *)((u8 *)rx_desc + rx_hl->fw_desc.len);
+
+       if (is_multicast_ether_addr(hdr->addr1)) {
+               /* Discard the fragment with multicast DA */
+               goto err;
+       }
+
        if (!MS(rx_desc_info, HTT_RX_DESC_HL_INFO_ENCRYPTED)) {
                spin_unlock_bh(&ar->data_lock);
                return ath10k_htt_rx_proc_rx_ind_hl(htt, &resp->rx_ind_hl, skb,
@@ -2624,8 +2631,6 @@ static bool ath10k_htt_rx_proc_rx_frag_ind_hl(struct ath10k_htt *htt,
                                                    HTT_RX_NON_TKIP_MIC);
        }
 
-       hdr = (struct ieee80211_hdr *)((u8 *)rx_desc + rx_hl->fw_desc.len);
-
        if (ieee80211_has_retry(hdr->frame_control))
                goto err;