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mac80211: Don't memset RXCB prior to PAE intercept

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commit c8a41c6afa upstream.

In ieee80211_deliver_skb_to_local_stack intercepts EAPoL frames if
mac80211 is configured to do so and forwards the contents over nl80211.
During this process some additional data is also forwarded, including
whether the frame was received encrypted or not.  Unfortunately just
prior to the call to ieee80211_deliver_skb_to_local_stack, skb->cb is
cleared, resulting in incorrect data being exposed over nl80211.

Fixes: 018f6fbf54 ("mac80211: Send control port frames over nl80211")
Cc: stable@vger.kernel.org
Signed-off-by: Denis Kenzior <denkenz@gmail.com>
Link: https://lore.kernel.org/r/20190827224120.14545-2-denkenz@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Denis Kenzior
2019-08-27 17:41:19 -05:00
committed by Greg Kroah-Hartman
parent 58f91aac4d
commit 4f139c0376
1 changed files with 2 additions and 2 deletions
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4
net/mac80211/rx.c
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@@ -2377,6 +2377,8 @@ static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
cfg80211_rx_control_port(dev, skb, noencrypt);
dev_kfree_skb(skb);
} else {
memset(skb->cb, 0, sizeof(skb->cb));
/* deliver to local stack */
if (rx->napi)
napi_gro_receive(rx->napi, skb);
@@ -2470,8 +2472,6 @@ ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
if (skb) {
skb->protocol = eth_type_trans(skb, dev);
memset(skb->cb, 0, sizeof(skb->cb));
ieee80211_deliver_skb_to_local_stack(skb, rx);
}