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ipv6: rt6_check should return NULL if 'from' is NULL

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[ Upstream commit 49d05fe2c9 ]

Paul reported that l2tp sessions were broken after the commit referenced
in the Fixes tag. Prior to this commit rt6_check returned NULL if the
rt6_info 'from' was NULL - ie., the dst_entry was disconnected from a FIB
entry. Restore that behavior.

Fixes: 93531c6743 ("net/ipv6: separate handling of FIB entries from dst based routes")
Reported-by: Paul Donohue <linux-kernel@PaulSD.com>
Tested-by: Paul Donohue <linux-kernel@PaulSD.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Ahern 2019-07-17 15:08:43 -07:00 committed by Greg Kroah-Hartman
parent 47ce442783
commit 0bd84505f1
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/route.c
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@ -2214,7 +2214,7 @@ static struct dst_entry *rt6_check(struct rt6_info *rt,
{
u32 rt_cookie = 0;
if ((from && !fib6_get_cookie_safe(from, &rt_cookie)) ||
if (!from || !fib6_get_cookie_safe(from, &rt_cookie) ||
rt_cookie != cookie)
return NULL;