[PATCH net 1/2] macsec: fix use-after-free of skb during RX

[Andreas Steinmetz]

Fix use-after-free of skb when rx_handler returns RX_HANDLER_PASS.

Signed-off-by: Andreas Steinmetz <a...@domdv.de>

--- a/drivers/net/macsec.c      2019-06-05 20:23:27.640154747 +0200
+++ b/drivers/net/macsec.c      2019-06-05 20:23:46.791565816 +0200
@@ -1103,10 +1103,9 @@ static rx_handler_result_t macsec_handle
        }
 
        skb = skb_unshare(skb, GFP_ATOMIC);
-       if (!skb) {
-               *pskb = NULL;
+       *pskb = skb;
+       if (!skb)
                return RX_HANDLER_CONSUMED;
-       }
 
        pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
        if (!pulled_sci) {