Re: [PATCH] taskstats: fix? sk_buff leak

[Oleg Nesterov <oleg@tv-sign.ru>]

On 10/29, Thomas Graf wrote:
>
> * Oleg Nesterov <oleg@tv-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@tv-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: