| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 25/50] macsec: fix use-after-free of skb during RX | Date | Fri, 26 Jul 2019 17:25:00 +0200 |
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From: Andreas Steinmetz <ast@domdv.de>
[ Upstream commit 095c02da80a41cf6d311c504d8955d6d1c2add10 ]
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/net/macsec.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
--- a/drivers/net/macsec.c +++ b/drivers/net/macsec.c @@ -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) {
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