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| author |   Steffen Klassert <steffen.klassert@secunet.com> | 2014-02-19 10:07:34 +0100 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2014-02-26 09:52:02 +0100 |
| commit | 3a9016f97fdc8bfbb26ff36ba8f3dc9162eb691b (patch) | |
| tree | 29319c7ec9ab7035398c1bef2bdbccd3cee718a2 /net/xfrm | |
| parent | xfrm: Clone states properly on migration (diff) | |
| download | linux-dev-3a9016f97fdc8bfbb26ff36ba8f3dc9162eb691b.tar.xz linux-dev-3a9016f97fdc8bfbb26ff36ba8f3dc9162eb691b.zip | |
xfrm: Fix unlink race when policies are deleted.
When a policy is unlinked from the lists in thread context,
the xfrm timer can fire before we can mark this policy as dead.
So reinitialize the bydst hlist, then hlist_unhashed() will
notice that this policy is not linked and will avoid a
doulble unlink of that policy.
Reported-by: Xianpeng Zhao <673321875@qq.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm')
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 4b98b25793c5..1d5c7bf29938 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -1158,7 +1158,7 @@ static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, if (hlist_unhashed(&pol->bydst)) return NULL; - hlist_del(&pol->bydst); + hlist_del_init(&pol->bydst); hlist_del(&pol->byidx); list_del(&pol->walk.all); net->xfrm.policy_count[dir]--; |