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ath10k: drop fragments with multicast DA for PCIe

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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>
Link: https://lore.kernel.org/r/20210511200110.5a0bd289bda8.Idd6ebea20038fb1cfee6de924aa595e5647c9eae@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Wen Gong 2021-05-11 20:02:53 +02:00 committed by Johannes Berg
parent a1166b2653
commit 65c415a144
1 changed files with 20 additions and 3 deletions
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23
drivers/net/wireless/ath/ath10k/htt_rx.c
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@ -1768,6 +1768,16 @@ static u64 ath10k_htt_rx_h_get_pn(struct ath10k *ar, struct sk_buff *skb,
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 ath10k *ar,
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 ath10k *ar,
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;
}