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| author | Timo Teräs <timo.teras@iki.fi> | 2010-06-24 14:35:00 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-06-24 14:35:00 -0700 |
| commit | b1312c89f0016f778cac4f1536f1434e132f8713 (patch) | |
| tree | 6cec9bc88430cf30f8409b8b607d2b6a6d2fd118 /net | |
| parent | 38000a94a902e94ca8b5498f7871c6316de8957a (diff) | |
| download | linux-stable-b1312c89f0016f778cac4f1536f1434e132f8713.tar.gz linux-stable-b1312c89f0016f778cac4f1536f1434e132f8713.tar.bz2 linux-stable-b1312c89f0016f778cac4f1536f1434e132f8713.zip | |
xfrm: check bundle policy existance before dereferencing it
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 <justinmattock@gmail.com>
Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 4bf27d901333..af1c173be4ad 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 && |