Patchwork netfilter: bridge: refcount fix

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Submitter Eric Dumazet
Date Aug. 24, 2009, 5:18 p.m.
Message ID <4A92CB67.1080401@gmail.com>
Download mbox | patch
Permalink /patch/31969/
State Not Applicable
Delegated to: David Miller
Headers show

Comments

Eric Dumazet - Aug. 24, 2009, 5:18 p.m.
Hi David

I found following by code review only, I am not sure it is critical enough for net-2.6

This is a stable candidate, bug is more than 2 years old.

Thanks

commit f216f082b2b37c4943f1e7c393e2786648d48f6f
([NETFILTER]: bridge netfilter: deal with martians correctly)
added a refcount leak on in_dev.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
---

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Patrick McHardy - Aug. 24, 2009, 5:22 p.m.
Eric Dumazet wrote:
> Hi David
> 
> I found following by code review only, I am not sure it is critical enough for net-2.6
> 
> This is a stable candidate, bug is more than 2 years old.
> 
> Thanks
> 
> commit f216f082b2b37c4943f1e7c393e2786648d48f6f
> ([NETFILTER]: bridge netfilter: deal with martians correctly)
> added a refcount leak on in_dev.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
> ---
> diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
> index 4fde742..c62eca3 100644
> --- a/net/bridge/br_netfilter.c
> +++ b/net/bridge/br_netfilter.c
> @@ -386,6 +386,7 @@ static int br_nf_pre_routing_finish(struct sk_buff *skb)
>  				dst_release((struct dst_entry *)rt);
>  			}
>  free_skb:
> +			in_dev_put(in_dev);
>  			kfree_skb(skb);
>  			return 0;

I guess we could simply use __in_dev_get_rcu() here since all
netfilter hooks are running under rcu_read_lock() anyways.
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Patch

diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index 4fde742..c62eca3 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -386,6 +386,7 @@  static int br_nf_pre_routing_finish(struct sk_buff *skb)
 				dst_release((struct dst_entry *)rt);
 			}
 free_skb:
+			in_dev_put(in_dev);
 			kfree_skb(skb);
 			return 0;
 		} else {