netdev - [RFC/PATCH 1/4] UDP memory usage accounting (take 4): fix send buffer check

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Date:	Sat, 06 Oct 2007 00:00:18 +0900
From:	Satoshi OSHIMA <satoshi.oshima.fk@...achi.com>
To:	Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	netdev <netdev@...r.kernel.org>, ?? ?? <yoshfuji@...ux-ipv6.org>
Cc:	Yumiko SUGITA <yumiko.sugita.yf@...achi.com>,
	"??@...Hat" <haoki@...hat.com>
Subject: [RFC/PATCH 1/4] UDP memory usage accounting (take 4): fix send buffer
 check

This patch introduces sndbuf size check before
memory allcation for send buffer.


signed-off-by: Satoshi Oshima <satoshi.oshima.fk@...achi.com>
signed-off-by: Hideo Aoki <haoki@...hat.com>

Index: 2.6.23-rc7-udp_limit/net/ipv4/ip_output.c
===================================================================
--- 2.6.23-rc7-udp_limit.orig/net/ipv4/ip_output.c
+++ 2.6.23-rc7-udp_limit/net/ipv4/ip_output.c
@@ -1004,6 +1004,11 @@ alloc_new_skb:
 					frag = &skb_shinfo(skb)->frags[i];
 				}
 			} else if (i < MAX_SKB_FRAGS) {
+				if (atomic_read(&sk->sk_wmem_alloc) + PAGE_SIZE
+				    > 2 * sk->sk_sndbuf) {
+					err = -ENOBUFS;
+					goto error;
+				}
 				if (copy > PAGE_SIZE)
 					copy = PAGE_SIZE;
 				page = alloc_pages(sk->sk_allocation, 0);

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