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From: Wen Gong <wgong@codeaurora.org>
Date: Tue, 11 May 2021 20:02:53 +0200
Subject: [PATCH] ath10k: drop fragments with multicast DA for PCIe
Fragmentation is not used with multicast frames. Discard unexpected
fragments with multicast DA. This fixes CVE-2020-26145.
Tested-on: QCA6174 hw3.2 PCI WLAN.RM.4.4.1-00110-QCARMSWP-1
Cc: stable@vger.kernel.org
Signed-off-by: Wen Gong <wgong@codeaurora.org>
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
--- a/drivers/net/wireless/ath/ath10k/htt_rx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
@@ -1768,6 +1768,16 @@ static u64 ath10k_htt_rx_h_get_pn(struct
return pn;
}
+static bool ath10k_htt_rx_h_frag_multicast_check(struct ath10k *ar,
+ struct sk_buff *skb,
+ u16 offset)
+{
+ struct ieee80211_hdr *hdr;
+
+ hdr = (struct ieee80211_hdr *)(skb->data + offset);
+ return !is_multicast_ether_addr(hdr->addr1);
+}
+
static bool ath10k_htt_rx_h_frag_pn_check(struct ath10k *ar,
struct sk_buff *skb,
u16 peer_id,
@@ -1839,7 +1849,7 @@ static void ath10k_htt_rx_h_mpdu(struct
bool is_decrypted;
bool is_mgmt;
u32 attention;
- bool frag_pn_check = true;
+ bool frag_pn_check = true, multicast_check = true;
if (skb_queue_empty(amsdu))
return;
@@ -1946,13 +1956,20 @@ static void ath10k_htt_rx_h_mpdu(struct
0,
enctype);
- if (!frag_pn_check) {
- /* Discard the fragment with invalid PN */
+ if (frag)
+ multicast_check = ath10k_htt_rx_h_frag_multicast_check(ar,
+ msdu,
+ 0);
+
+ if (!frag_pn_check || !multicast_check) {
+ /* Discard the fragment with invalid PN or multicast DA
+ */
temp = msdu->prev;
__skb_unlink(msdu, amsdu);
dev_kfree_skb_any(msdu);
msdu = temp;
frag_pn_check = true;
+ multicast_check = true;
continue;
}
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