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flowcache: Fix resource leaks on namespace exit. 

We leak an active timer, the hotcpu notifier and all allocated
resources when we exit a namespace. Fix this by introducing a
flow_cache_fini() function where we release the resources before
we exit.

Fixes: ca925cf153 ("flowcache: Make flow cache name space aware")
Reported-by: Jakub Kicinski <moorray3@wp.pl>
Tested-by: Jakub Kicinski <moorray3@wp.pl>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Fan Du <fan.du@windriver.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steffen Klassert 2014-03-12 09:43:17 +01:00 committed by David S. Miller
parent 1f36fc74d8
commit 4a93f5095a
3 changed files with 26 additions and 1 deletions
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1
include/net/flow.h
View File

@ -219,6 +219,7 @@ struct flow_cache_object *flow_cache_lookup(struct net *net,
u8 dir, flow_resolve_t resolver,
void *ctx);
int flow_cache_init(struct net *net);
void flow_cache_fini(struct net *net);
void flow_cache_flush(struct net *net);
void flow_cache_flush_deferred(struct net *net);

19
net/core/flow.c
View File

@ -484,3 +484,22 @@ err:
return -ENOMEM;
}
EXPORT_SYMBOL(flow_cache_init);
void flow_cache_fini(struct net *net)
{
int i;
struct flow_cache *fc = &net->xfrm.flow_cache_global;
del_timer_sync(&fc->rnd_timer);
unregister_hotcpu_notifier(&fc->hotcpu_notifier);
for_each_possible_cpu(i) {
struct flow_cache_percpu *fcp = per_cpu_ptr(fc->percpu, i);
kfree(fcp->hash_table);
fcp->hash_table = NULL;
}
free_percpu(fc->percpu);
fc->percpu = NULL;
}
EXPORT_SYMBOL(flow_cache_fini);

7
net/xfrm/xfrm_policy.c
View File

@ -2913,15 +2913,19 @@ static int __net_init xfrm_net_init(struct net *net)
rv = xfrm_sysctl_init(net);
if (rv < 0)
goto out_sysctl;
rv = flow_cache_init(net);
if (rv < 0)
goto out;
/* Initialize the per-net locks here */
spin_lock_init(&net->xfrm.xfrm_state_lock);
rwlock_init(&net->xfrm.xfrm_policy_lock);
mutex_init(&net->xfrm.xfrm_cfg_mutex);
flow_cache_init(net);
return 0;
out:
xfrm_sysctl_fini(net);
out_sysctl:
xfrm_policy_fini(net);
out_policy:
@ -2934,6 +2938,7 @@ out_statistics:
static void __net_exit xfrm_net_exit(struct net *net)
{
flow_cache_fini(net);
xfrm_sysctl_fini(net);
xfrm_policy_fini(net);
xfrm_state_fini(net);