net: Fix use after free by removing length arg from sk_data_ready callbacks.

Several spots in the kernel perform a sequence like:

	skb_queue_tail(&sk->s_receive_queue, skb);
	sk->sk_data_ready(sk, skb->len);

But at the moment we place the SKB onto the socket receive queue it
can be consumed and freed up.  So this skb->len access is potentially
to freed up memory.

Furthermore, the skb->len can be modified by the consumer so it is
possible that the value isn't accurate.

And finally, no actual implementation of this callback actually uses
the length argument.  And since nobody actually cared about it's
value, lots of call sites pass arbitrary values in such as '0' and
even '1'.

So just remove the length argument from the callback, that way there
is no confusion whatsoever and all of these use-after-free cases get
fixed as a side effect.

Based upon a patch by Eric Dumazet and his suggestion to audit this
issue tree-wide.

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 2 insertions, 2 deletions

diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index 6177479c7de9..5ad4418ef093 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -1064,7 +1064,7 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
         x25_start_heartbeat(make);
 
         if (!sock_flag(sk, SOCK_DEAD))
-                sk->sk_data_ready(sk, skb->len);
+                sk->sk_data_ready(sk);
         rc = 1;
         sock_put(sk);
 out:
diff --git a/net/x25/x25_in.c b/net/x25/x25_in.c
index d1b0dc79bb6f..7ac50098a375 100644
--- a/net/x25/x25_in.c
+++ b/net/x25/x25_in.c
@@ -79,7 +79,7 @@ static int x25_queue_rx_frame(struct sock *sk, struct sk_buff *skb, int more)
         skb_set_owner_r(skbn, sk);
         skb_queue_tail(&sk->sk_receive_queue, skbn);
         if (!sock_flag(sk, SOCK_DEAD))
-                sk->sk_data_ready(sk, skbn->len);
+                sk->sk_data_ready(sk);
 
         return 0;
 }