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[NETFILTER]: ipt_CLUSTERIP: fix race between clusterip_config_find_get and _entry_put

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Consider we are putting a clusterip_config entry with the "entries"
count == 1, and on the other CPU there's a clusterip_config_find_get
in progress:

CPU1:							CPU2:
clusterip_config_entry_put:				clusterip_config_find_get:
if (atomic_dec_and_test(&c->entries)) {
	/* true */
							read_lock_bh(&clusterip_lock);
							c = __clusterip_config_find(clusterip);
							/* found - it's still in list */
							...
							atomic_inc(&c->entries);
							read_unlock_bh(&clusterip_lock);

	write_lock_bh(&clusterip_lock);
	list_del(&c->list);
	write_unlock_bh(&clusterip_lock);
	...
	dev_put(c->dev);

Oops! We have an entry returned by the clusterip_config_find_get,
which is a) not in list b) has a stale dev pointer.

The problems will happen when the CPU2 will release the entry - it
will remove it from the list for the 2nd time, thus spoiling it, and
will put a stale dev pointer.

The fix is to make atomic_dec_and_test under the clusterip_lock.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Pavel Emelyanov 2008-04-14 00:44:52 -07:00 committed by David S. Miller
parent 9625ed72e8
commit 4dee959723
1 changed files with 3 additions and 1 deletions
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4
net/ipv4/netfilter/ipt_CLUSTERIP.c
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@ -82,8 +82,8 @@ clusterip_config_put(struct clusterip_config *c)
static inline void
clusterip_config_entry_put(struct clusterip_config *c)
{
write_lock_bh(&clusterip_lock);
if (atomic_dec_and_test(&c->entries)) {
write_lock_bh(&clusterip_lock);
list_del(&c->list);
write_unlock_bh(&clusterip_lock);
@ -96,7 +96,9 @@ clusterip_config_entry_put(struct clusterip_config *c)
#ifdef CONFIG_PROC_FS
remove_proc_entry(c->pde->name, c->pde->parent);
#endif
return;
}
write_unlock_bh(&clusterip_lock);
}
static struct clusterip_config *