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Subject[PATCH 4.14 090/496] xfrm: do not call rcu_read_unlock when afinfo is NULL in xfrm_get_tos
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

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

[ Upstream commit 143a4454daaf0e80a2b9f37159a0d6d2b61e64ed ]

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.xin@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/xfrm/xfrm_policy.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1459,10 +1459,13 @@ xfrm_tmpl_resolve(struct xfrm_policy **p
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();


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