X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Finclude%2Fnet%2Fsock.h;fp=kernel%2Finclude%2Fnet%2Fsock.h;h=3d5ff7436f41040eb7cbd9ef09f9cc57219b24c3;hb=52f993b8e89487ec9ee15a7fb4979e0f09a45b27;hp=14d3c07340079b7a3e9de54ee635011589247ffd;hpb=c189ccac5702322ed843fe17057035b7222a59b6;p=kvmfornfv.git

diff --git a/kernel/include/net/sock.h b/kernel/include/net/sock.h
index 14d3c0734..3d5ff7436 100644
--- a/kernel/include/net/sock.h
+++ b/kernel/include/net/sock.h
@@ -1425,6 +1425,16 @@ static inline void sk_mem_uncharge(struct sock *sk, int size)
 	if (!sk_has_account(sk))
 		return;
 	sk->sk_forward_alloc += size;
+
+	/* Avoid a possible overflow.
+	 * TCP send queues can make this happen, if sk_mem_reclaim()
+	 * is not called and more than 2 GBytes are released at once.
+	 *
+	 * If we reach 2 MBytes, reclaim 1 MBytes right now, there is
+	 * no need to hold that much forward allocation anyway.
+	 */
+	if (unlikely(sk->sk_forward_alloc >= 1 << 21))
+		__sk_mem_reclaim(sk, 1 << 20);
 }
 
 static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb)