From: Cong Wang <cwang@twopensource.com>
Date: Wed, 15 Oct 2014 21:33:20 +0000 (-0700)
Subject: ipv4: call __ip_options_echo() in cookie_v4_check()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2077eebf7d8bf20b36524de45851e28111a60c52;p=linux-beck.git

ipv4: call __ip_options_echo() in cookie_v4_check()

commit 971f10eca186cab238c49da ("tcp: better TCP_SKB_CB layout to reduce cache line misses")
missed that cookie_v4_check() still calls ip_options_echo() which uses
IPCB(). It should use TCPCB() at TCP layer, so call __ip_options_echo()
instead.

Fixes: commit 971f10eca186cab238c49da ("tcp: better TCP_SKB_CB layout to reduce cache line misses")
Cc: Krzysztof Kolasa <kkolasa@winsoft.pl>
Cc: Eric Dumazet <edumazet@google.com>
Reported-by: Krzysztof Kolasa <kkolasa@winsoft.pl>
Tested-by: Krzysztof Kolasa <kkolasa@winsoft.pl>
Signed-off-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 0431a8f3c8f4..7e7401cdb9d7 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -321,7 +321,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
 		int opt_size = sizeof(struct ip_options_rcu) + opt->optlen;
 
 		ireq->opt = kmalloc(opt_size, GFP_ATOMIC);
-		if (ireq->opt != NULL && ip_options_echo(&ireq->opt->opt, skb)) {
+		if (ireq->opt != NULL && __ip_options_echo(&ireq->opt->opt, skb, opt)) {
 			kfree(ireq->opt);
 			ireq->opt = NULL;
 		}