tcp: fix over estimation in sk_forced_mem_schedule()

sk_forced_mem_schedule() has a bug similar to ones fixed
in commit 91efb764f795 ("net: fix sk_wmem_schedule() and
sk_rmem_schedule() errors")

While this bug has little chance to trigger in old kernels,
we need to fix it before the following patch.

Fixes: 5d35369de88a ("tcp: fix possible deadlock in tcp_send_fin()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Reviewed-by: Wei Wang <weiwan@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 8ab98e1aca6797a51eaaf8886680d2001a616948..18c913a2347a984ae8cf2793bb8991e59e5e94ab 100644 (file)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -3362,11 +3362,12 @@ void tcp_xmit_retransmit_queue(struct sock *sk)
  */
 void sk_forced_mem_schedule(struct sock *sk, int size)
 {
-       int amt;
+       int delta, amt;
 
-       if (size <= sk->sk_forward_alloc)
+       delta = size - sk->sk_forward_alloc;
+       if (delta <= 0)
                return;
-       amt = sk_mem_pages(size);
+       amt = sk_mem_pages(delta);
        sk->sk_forward_alloc += amt << PAGE_SHIFT;
        sk_memory_allocated_add(sk, amt);