netdev - [PATCH][XFRM] Fix potential race vs xfrm_state(only)_find and xfrm_hash

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Date:	Thu, 13 Dec 2007 13:56:14 +0300
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	David Miller <davem@...emloft.net>
CC:	Herbert Xu <herbert@...dor.apana.org.au>,
	Linux Netdev List <netdev@...r.kernel.org>, devel@...nvz.org
Subject: [PATCH][XFRM] Fix potential race vs xfrm_state(only)_find and xfrm_hash_resize.

The _find calls calculate the hash value using the 
xfrm_state_hmask, without the xfrm_state_lock. But the 
value of this mask can change in the _resize call under
the state_lock, so we risk to fail in finding the desired 
entry in hash.

I think, that the hash value is better to calculate
under the state lock.

Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>

---

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 1af522b..1face71 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -759,7 +759,7 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
 		struct xfrm_policy *pol, int *err,
 		unsigned short family)
 {
-	unsigned int h = xfrm_dst_hash(daddr, saddr, tmpl->reqid, family);
+	unsigned int h;
 	struct hlist_node *entry;
 	struct xfrm_state *x, *x0;
 	int acquire_in_progress = 0;
@@ -767,6 +767,7 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
 	struct xfrm_state *best = NULL;
 
 	spin_lock_bh(&xfrm_state_lock);
+	h = xfrm_dst_hash(daddr, saddr, tmpl->reqid, family);
 	hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) {
 		if (x->props.family == family &&
 		    x->props.reqid == tmpl->reqid &&
@@ -868,11 +869,12 @@ struct xfrm_state *
 xfrm_stateonly_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
 		    unsigned short family, u8 mode, u8 proto, u32 reqid)
 {
-	unsigned int h = xfrm_dst_hash(daddr, saddr, reqid, family);
+	unsigned int h;
 	struct xfrm_state *rx = NULL, *x = NULL;
 	struct hlist_node *entry;
 
 	spin_lock(&xfrm_state_lock);
+	h = xfrm_dst_hash(daddr, saddr, reqid, family);
 	hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) {
 		if (x->props.family == family &&
 		    x->props.reqid == reqid &&
--
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