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[4.14] mac80211: fix memory corruption in EAPOL handling

Message ID 20210710183807.5792-1-davis@mosenkovs.lv
State Superseded
Headers show
Series [4.14] mac80211: fix memory corruption in EAPOL handling | expand

Commit Message

Davis July 10, 2021, 6:38 p.m. UTC
Commit 557bb37533a3 ("mac80211: do not accept/forward invalid EAPOL
frames") uses skb_mac_header() before eth_type_trans() is called
leading to incorrect pointer, the pointer gets written to. This issue
has appeared during backporting to 4.4, 4.9 and 4.14.

Fixes: 557bb37533a3 ("mac80211: do not accept/forward invalid EAPOL frames")
Link: https://lore.kernel.org/r/CAHQn7pKcyC_jYmGyTcPCdk9xxATwW5QPNph=bsZV8d-HPwNsyA@mail.gmail.com
Cc: <stable@vger.kernel.org> # 4.14.x
Signed-off-by: Davis Mosenkovs <davis@mosenkovs.lv>
---
 net/mac80211/rx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index ac2c52709e1c..87926c6fe0bf 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2404,7 +2404,7 @@  ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
 #endif
 
 	if (skb) {
-		struct ethhdr *ehdr = (void *)skb_mac_header(skb);
+		struct ethhdr *ehdr = (struct ethhdr *)skb->data;
 
 		/* deliver to local stack */
 		skb->protocol = eth_type_trans(skb, dev);