net: really orphan skbs tied to closing sk

If the owing socket is shutting down - e.g. the sock reference
count already dropped to 0 and only sk_wmem_alloc is keeping
the sock alive, skb_orphan_partial() becomes a no-op.

When forwarding packets over veth with GRO enabled, the above
causes refcount errors.

This change addresses the issue with a plain skb_orphan() call
in the critical scenario.

Fixes: 9adc89af724f ("net: let skb_orphan_partial wake-up waiters.")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/sock.h b/include/net/sock.h
index 42bc5e1..0e962d8 100644 (file)
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2231,13 +2231,15 @@ static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
        sk_mem_charge(sk, skb->truesize);
 }
 
-static inline void skb_set_owner_sk_safe(struct sk_buff *skb, struct sock *sk)
+static inline __must_check bool skb_set_owner_sk_safe(struct sk_buff *skb, struct sock *sk)
 {
        if (sk && refcount_inc_not_zero(&sk->sk_refcnt)) {
                skb_orphan(skb);
                skb->destructor = sock_efree;
                skb->sk = sk;
+               return true;
        }
+       return false;
 }
 
 void sk_reset_timer(struct sock *sk, struct timer_list *timer,

diff --git a/net/core/sock.c b/net/core/sock.c
index c761c4a..958614e 100644 (file)
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2132,10 +2132,10 @@ void skb_orphan_partial(struct sk_buff *skb)
        if (skb_is_tcp_pure_ack(skb))
                return;
 
-       if (can_skb_orphan_partial(skb))
-               skb_set_owner_sk_safe(skb, skb->sk);
-       else
-               skb_orphan(skb);
+       if (can_skb_orphan_partial(skb) && skb_set_owner_sk_safe(skb, skb->sk))
+               return;
+
+       skb_orphan(skb);
 }
 EXPORT_SYMBOL(skb_orphan_partial);