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[IPSEC]: Policy list disorder

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The recent hashing introduced an off-by-one bug in policy list insertion.
Instead of adding after the last entry with a lesser or equal priority,
we're adding after the successor of that entry.

This patch fixes this and also adds a warning if we detect a duplicate
entry in the policy list.  This should never happen due to this if clause.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2007-01-16 16:52:02 -08:00 committed by David S. Miller
parent 8f1adb5f27
commit a6c7ab55dd
1 changed files with 5 additions and 11 deletions
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16
net/xfrm/xfrm_policy.c
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@ -650,19 +650,18 @@ int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
struct xfrm_policy *pol;
struct xfrm_policy *delpol;
struct hlist_head *chain;
struct hlist_node *entry, *newpos, *last;
struct hlist_node *entry, *newpos;
struct dst_entry *gc_list;
write_lock_bh(&xfrm_policy_lock);
chain = policy_hash_bysel(&policy->selector, policy->family, dir);
delpol = NULL;
newpos = NULL;
last = NULL;
hlist_for_each_entry(pol, entry, chain, bydst) {
if (!delpol &&
pol->type == policy->type &&
if (pol->type == policy->type &&
!selector_cmp(&pol->selector, &policy->selector) &&
xfrm_sec_ctx_match(pol->security, policy->security)) {
xfrm_sec_ctx_match(pol->security, policy->security) &&
!WARN_ON(delpol)) {
if (excl) {
write_unlock_bh(&xfrm_policy_lock);
return -EEXIST;
@ -671,17 +670,12 @@ int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
if (policy->priority > pol->priority)
continue;
} else if (policy->priority >= pol->priority) {
last = &pol->bydst;
newpos = &pol->bydst;
continue;
}
if (!newpos)
newpos = &pol->bydst;
if (delpol)
break;
last = &pol->bydst;
}
if (!newpos)
newpos = last;
if (newpos)
hlist_add_after(newpos, &policy->bydst);
else