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macsec: fix use-after-free of skb during RX

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

Signed-off-by: Andreas Steinmetz <ast@domdv.de>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andreas Steinmetz 2019-06-30 22:46:42 +02:00 committed by David S. Miller
parent e835ada070
commit 095c02da80
1 changed files with 2 additions and 3 deletions
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5
drivers/net/macsec.c
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@ -1099,10 +1099,9 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
} }
skb = skb_unshare(skb, GFP_ATOMIC); skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb) { *pskb = skb;
*pskb = NULL; if (!skb)
return RX_HANDLER_CONSUMED; return RX_HANDLER_CONSUMED;
}
pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
if (!pulled_sci) { if (!pulled_sci) {