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Message-ID: <20061029134557.GA1500@oleg>
Date: Sun, 29 Oct 2006 16:45:58 +0300
From: Oleg Nesterov <oleg@...sign.ru>
To: Thomas Graf <tgraf@...g.ch>
Cc: Andrew Morton <akpm@...l.org>,
Shailabh Nagar <nagar@...son.ibm.com>,
Balbir Singh <balbir@...ibm.com>, Jay Lan <jlan@....com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] taskstats: fix? sk_buff leak
On 10/29, Thomas Graf wrote:
>
> * Oleg Nesterov <oleg@...sign.ru> 2006-10-29 16:24
> > nla_put_failure:
> > - return genlmsg_cancel(rep_skb, reply);
> > + genlmsg_cancel(rep_skb, reply);
>
> rc = genlmsg_cancel(...) or return value is undefined.
Thanks!
[PATCH] taskstats: fix sk_buff leak
Compile tested.
'return genlmsg_cancel()' in taskstats_user_cmd/taskstats_exit_send looks
wrong to me. Unless we pass 'rep_skb' to the netlink layer we own sk_buff.
This means we should always do kfree_skb() on failure.
Signed-off-by: Oleg Nesterov <oleg@...sign.ru>
--- STATS/kernel/taskstats.c~1_skb 2006-10-29 15:12:51.000000000 +0300
+++ STATS/kernel/taskstats.c 2006-10-29 16:39:10.000000000 +0300
@@ -411,7 +411,7 @@ static int taskstats_user_cmd(struct sk_
return send_reply(rep_skb, info->snd_pid);
nla_put_failure:
- return genlmsg_cancel(rep_skb, reply);
+ rc = genlmsg_cancel(rep_skb, reply);
err:
nlmsg_free(rep_skb);
return rc;
@@ -507,7 +507,6 @@ send:
nla_put_failure:
genlmsg_cancel(rep_skb, reply);
- goto ret;
err_skb:
nlmsg_free(rep_skb);
ret:
-
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