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macvtap: fix use after free for skb_array during release 

We've clean skb_array in macvtap_put_queue() but still try to pop from
it during macvtap_sock_destruct(). Fix this use after free by moving
the skb array cleanup to macvtap_sock_destruct() instead.

Fixes: 362899b872 ("macvtap: switch to use skb array")
Reported-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Tested-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Jason Wang 2016-08-11 18:15:56 +08:00 committed by David S. Miller
parent 4b5b9ba553
commit 104a493390
1 changed files with 1 additions and 4 deletions
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5
drivers/net/macvtap.c
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@ -275,7 +275,6 @@ static void macvtap_put_queue(struct macvtap_queue *q)
rtnl_unlock();
synchronize_rcu();
skb_array_cleanup(&q->skb_array);
sock_put(&q->sk);
}
@ -533,10 +532,8 @@ static void macvtap_sock_write_space(struct sock *sk)
static void macvtap_sock_destruct(struct sock *sk)
{
struct macvtap_queue *q = container_of(sk, struct macvtap_queue, sk);
struct sk_buff *skb;
while ((skb = skb_array_consume(&q->skb_array)) != NULL)
kfree_skb(skb);
skb_array_cleanup(&q->skb_array);
}
static int macvtap_open(struct inode *inode, struct file *file)