[PATCH net] sctp: increase sk_wmem_alloc when head->truesize is increased

[Xin Long]

I changed to count sk_wmem_alloc by skb truesize instead of 1 to
fix the sk_wmem_alloc leak caused by later truesize's change in
xfrm in Commit 02968ccf0125 ("sctp: count sk_wmem_alloc by skb
truesize in sctp_packet_transmit").

But I should have also increased sk_wmem_alloc when head->truesize
is increased in sctp_packet_gso_append() as xfrm does. Otherwise,
sctp gso packet will cause sk_wmem_alloc underflow.

Fixes: 02968ccf0125 ("sctp: count sk_wmem_alloc by skb truesize in 
sctp_packet_transmit")
Signed-off-by: Xin Long <lucien....@gmail.com>
---
 net/sctp/output.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/sctp/output.c b/net/sctp/output.c
index b0e74a3..025f48e 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -410,6 +410,7 @@ static void sctp_packet_gso_append(struct sk_buff *head, 
struct sk_buff *skb)
        head->truesize += skb->truesize;
        head->data_len += skb->len;
        head->len += skb->len;
+       refcount_add(skb->truesize, &head->sk->sk_wmem_alloc);
 
        __skb_header_release(skb);
 }
-- 
2.1.0