netdev - Re: [PATCH RESEND] sctp: fix incorrect overflow check on autoclose

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Date:	Tue, 13 Dec 2011 17:00:27 -0500
From:	Xi Wang <xi.wang@...il.com>
To:	Vladislav Yasevich <vladislav.yasevich@...com>
Cc:	netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrei Pelinescu-Onciul <andrei@...el.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH RESEND] sctp: fix incorrect overflow check on autoclose

On Dec 12, 2011, at 5:18 PM, Vladislav Yasevich wrote:
> Hm..  this is a bit strange.  This makes it so that on 32 bit platforms
> we have one upper bound for autoclose and on 64 we have another even though
> the type is platform dependent.  This could be considered a regression by
> applications.

Either looks good to me.  Timeout limit is essentially different on 32/64
platforms.

Another (probably uglier) option is to limit the value on 32-bit platform
only, like sock_setsockopt() in net/core/sock.c.

#if (BITS_PER_LONG == 32)
	if (sp->autoclose > MAX_SCHEDULE_TIMEOUT / HZ)
		sp->autoclose = MAX_SCHEDULE_TIMEOUT / HZ;
#endif

> In addition this would result in confusion to user since the values
> between setsockopt() and getsockopt() for autoclose would be different.

Are you suggesting to reject the value and return -EINVAL, rather than
silently limiting the autoclose value?

- xi
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