[PATCH 4.6 072/203] macsec: set actual real device for xmit when !protect_frames

From: Greg Kroah-Hartman
Date: Mon Jul 25 2016 - 17:40:20 EST

4.6-stable review patch. If anyone has any objections, please let me know.


From: Daniel Borkmann <daniel@xxxxxxxxxxxxx>

[ Upstream commit 79c62220d74a4a3f961a2cb7320da09eebf5daf7 ]

Avoid recursions of dev_queue_xmit() to the wrong net device when
frames are unprotected, since at that time skb->dev still points to
our own macsec dev and unlike macsec_encrypt_finish() dev pointer
doesn't get updated to real underlying device.

Fixes: c09440f7dcb3 ("macsec: introduce IEEE 802.1AE driver")
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Acked-by: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
Acked-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
drivers/net/macsec.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -2564,6 +2564,7 @@ static netdev_tx_t macsec_start_xmit(str
+ skb->dev = macsec->real_dev;
len = skb->len;
ret = dev_queue_xmit(skb);
count_tx(dev, ret, len);