From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Yajun Deng <yajun.deng@linux.dev>
Cc: kadlec@netfilter.org, fw@strlen.de, roopa@nvidia.com,
nikolay@nvidia.com, davem@davemloft.net, kuba@kernel.org,
netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
bridge@lists.linux-foundation.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] netfilter: nf_conntrack_bridge: Fix not free when error
Date: Wed, 28 Jul 2021 18:18:49 +0200 [thread overview]
Message-ID: <20210728161849.GA10433@salvia> (raw)
In-Reply-To: <20210726035702.11964-1-yajun.deng@linux.dev>
[-- Attachment #1: Type: text/plain, Size: 1276 bytes --]
On Mon, Jul 26, 2021 at 11:57:02AM +0800, Yajun Deng wrote:
> It should be added kfree_skb_list() when err is not equal to zero
> in nf_br_ip_fragment().
>
> Fixes: 3c171f496ef5 ("netfilter: bridge: add connection tracking system")
> Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
> ---
> net/bridge/netfilter/nf_conntrack_bridge.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/net/bridge/netfilter/nf_conntrack_bridge.c b/net/bridge/netfilter/nf_conntrack_bridge.c
> index 8d033a75a766..059f53903eda 100644
> --- a/net/bridge/netfilter/nf_conntrack_bridge.c
> +++ b/net/bridge/netfilter/nf_conntrack_bridge.c
> @@ -83,12 +83,16 @@ static int nf_br_ip_fragment(struct net *net, struct sock *sk,
>
> skb->tstamp = tstamp;
> err = output(net, sk, data, skb);
> - if (err || !iter.frag)
> - break;
> -
> + if (err) {
> + kfree_skb_list(iter.frag);
> + return err;
> + }
> +
> + if (!iter.frag)
> + return 0;
> +
> skb = ip_fraglist_next(&iter);
> }
> - return err;
Why removing this line above? It enters slow_path: on success.
This patch instead will keep this aligned with IPv6.
> }
> slow_path:
> /* This is a linearized skbuff, the original geometry is lost for us.
> --
> 2.32.0
>
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[-- Type: text/x-diff, Size: 460 bytes --]
diff --git a/net/bridge/netfilter/nf_conntrack_bridge.c b/net/bridge/netfilter/nf_conntrack_bridge.c
index 8d033a75a766..3cf5457919c6 100644
--- a/net/bridge/netfilter/nf_conntrack_bridge.c
+++ b/net/bridge/netfilter/nf_conntrack_bridge.c
@@ -88,6 +88,11 @@ static int nf_br_ip_fragment(struct net *net, struct sock *sk,
skb = ip_fraglist_next(&iter);
}
+
+ if (!err)
+ return 0;
+
+ kfree_skb_list(iter.frag_list);
return err;
}
slow_path:
next prev parent reply other threads:[~2021-07-28 16:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-26 3:57 [PATCH] netfilter: nf_conntrack_bridge: Fix not free when error Yajun Deng
2021-07-28 16:18 ` Pablo Neira Ayuso [this message]
2021-07-29 3:19 ` yajun.deng
2021-07-29 7:24 ` Pablo Neira Ayuso
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