Commit e3d4030498c3 ("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: e3d4030498c3 ("mac80211: do not accept/forward invalid EAPOL frames") Link: https://lore.kernel.org/r/CAHQn7pKcyC_jYmGyTcPCdk9xxATwW5QPNph=bsZV8d-HPwNsy... Cc: stable@vger.kernel.org # 4.4.x Signed-off-by: Davis Mosenkovs davis@mosenkovs.lv --- net/mac80211/rx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index bde924968cd2..b5848bcc09eb 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -2234,7 +2234,7 @@ 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);