From b1312c89f0016f778cac4f1536f1434e132f8713 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Timo=20Ter=C3=A4s?= Date: Thu, 24 Jun 2010 14:35:00 -0700 Subject: [PATCH] xfrm: check bundle policy existance before dereferencing it MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Fix the bundle validation code to not assume having a valid policy. When we have multiple transformations for a xfrm policy, the bundle instance will be a chain of bundles with only the first one having the policy reference. When policy_genid is bumped it will expire the first bundle in the chain which is equivalent of expiring the whole chain. Reported-bisected-and-tested-by: Justin P. Mattock Signed-off-by: Timo Teräs Signed-off-by: David S. Miller --- net/xfrm/xfrm_policy.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 4bf27d9..af1c173 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -2300,7 +2300,8 @@ int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, return 0; if (xdst->xfrm_genid != dst->xfrm->genid) return 0; - if (xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) + if (xdst->num_pols > 0 && + xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) return 0; if (strict && fl && -- 2.7.4