[ATM] CLIP: Do not refer freed skbuff in clip_mkip().

In clip_mkip(), skb->dev is dereferenced after clip_push(),
which frees up skb.

Advisory: AD_LAB-06009 (<adlab@venustech.com.cn>).

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/atm/clip.c b/net/atm/clip.c
index 7ce7bfe3fbad..7af2c411da82 100644
--- a/net/atm/clip.c
+++ b/net/atm/clip.c
@@ -500,9 +500,11 @@ static int clip_mkip(struct atm_vcc *vcc, int timeout)
                 } else {
                         unsigned int len = skb->len;
 
+                        skb_get(skb);
                         clip_push(vcc, skb);
                         PRIV(skb->dev)->stats.rx_packets--;
                         PRIV(skb->dev)->stats.rx_bytes -= len;
+                        kfree_skb(skb);
                 }
         return 0;
 }