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authorSteffen Klassert <steffen.klassert@secunet.com>2014-02-19 10:07:34 +0100
committerSteffen Klassert <steffen.klassert@secunet.com>2014-02-26 09:52:02 +0100
commit3a9016f97fdc8bfbb26ff36ba8f3dc9162eb691b (patch)
tree29319c7ec9ab7035398c1bef2bdbccd3cee718a2
parentee5c23176fcc820f7a56d3e86001532af0d59b1e (diff)
downloadop-kernel-dev-3a9016f97fdc8bfbb26ff36ba8f3dc9162eb691b.zip
op-kernel-dev-3a9016f97fdc8bfbb26ff36ba8f3dc9162eb691b.tar.gz
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>
-rw-r--r--net/xfrm/xfrm_policy.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 4b98b25..1d5c7bf 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]--;
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