[PATCH 4.14 10/35] ipv6: fix the check before getting the cookie in rt6_get_cookie

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

From: Xin Long <lucien.xin@gmail.com>

[ Upstream commit b7999b07726c16974ba9ca3bb9fe98ecbec5f81c ]

In Jianlin's testing, netperf was broken with 'Connection reset by peer',
as the cookie check failed in rt6_check() and ip6_dst_check() always
returned NULL.

It's caused by Commit 93531c674315 ("net/ipv6: separate handling of FIB
entries from dst based routes"), where the cookie can be got only when
'c1'(see below) for setting dst_cookie whereas rt6_check() is called
when !'c1' for checking dst_cookie, as we can see in ip6_dst_check().

Since in ip6_dst_check() both rt6_dst_from_check() (c1) and rt6_check()
(!c1) will check the 'from' cookie, this patch is to remove the c1 check
in rt6_get_cookie(), so that the dst_cookie can always be set properly.

c1:
  (rt->rt6i_flags & RTF_PCPU || unlikely(!list_empty(&rt->rt6i_uncached)))

Fixes: 93531c674315 ("net/ipv6: separate handling of FIB entries from dst based routes")
Reported-by: Jianlin Shi <jishi@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 include/net/ip6_fib.h |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -199,8 +199,7 @@ static inline u32 rt6_get_cookie(const s
 {
 	u32 cookie = 0;
 
-	if (rt->rt6i_flags & RTF_PCPU ||
-	    (unlikely(!list_empty(&rt->rt6i_uncached)) && rt->dst.from))
+	if (rt->dst.from)
 		rt = (struct rt6_info *)(rt->dst.from);
 
 	rt6_get_cookie_safe(rt, &cookie);