[PATCH 5/9] xfrm: do not call rcu_read_unlock when afinfo is NULL in xfrm_get_tos

[Steffen Klassert]

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

When xfrm_policy_get_afinfo returns NULL, it will not hold rcu
read lock. In this case, rcu_read_unlock should not be called
in xfrm_get_tos, just like other places where it's calling
xfrm_policy_get_afinfo.

Fixes: f5e2bb4f5b22 ("xfrm: policy: xfrm_get_tos cannot fail")
Signed-off-by: Xin Long <lucien....@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
---
 net/xfrm/xfrm_policy.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 8b3811ff002d..150d46633ce6 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1458,10 +1458,13 @@ xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, 
const struct flowi *fl,
 static int xfrm_get_tos(const struct flowi *fl, int family)
 {
        const struct xfrm_policy_afinfo *afinfo;
-       int tos = 0;
+       int tos;
 
        afinfo = xfrm_policy_get_afinfo(family);
-       tos = afinfo ? afinfo->get_tos(fl) : 0;
+       if (!afinfo)
+               return 0;
+
+       tos = afinfo->get_tos(fl);
 
        rcu_read_unlock();
 
-- 
2.14.1