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[IPSEC]: Check validity of direction in xfrm_policy_byid 

The function xfrm_policy_byid takes a dir argument but finds the policy
using the index instead.  We only use the dir argument to update the
policy count for that direction.  Since the user can supply any value
for dir, this can corrupt our policy count.

I know this is the problem because a few days ago I was deleting
policies by hand using indicies and accidentally typed in the wrong
direction.  It still deleted the policy and at the time I thought
that was cool.  In retrospect it isn't such a good idea :)

I decided against letting it delete the policy anyway just in case
we ever remove the connection between indicies and direction.

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 2007-05-14 02:15:47 -07:00 committed by David S. Miller
parent 705962ccc9
commit b5505c6e10
1 changed files with 4 additions and 0 deletions
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4
net/xfrm/xfrm_policy.c
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@ -796,6 +796,10 @@ struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete,
struct hlist_head *chain;
struct hlist_node *entry;
*err = -ENOENT;
if (xfrm_policy_id2dir(id) != dir)
return NULL;
*err = 0;
write_lock_bh(&xfrm_policy_lock);
chain = xfrm_policy_byidx + idx_hash(id);