linux-kernel - Re: scatterlist.c: bug in sg

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Message-ID: <c384c5ea0809280851j59fe7201yda71b2101f4cb8e2@mail.gmail.com>
Date:	Sun, 28 Sep 2008 17:51:07 +0200
From:	"Leon Woestenberg" <leon.woestenberg@...il.com>
To:	"Boaz Harrosh" <bharrosh@...asas.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: scatterlist.c: bug in sg_next()?

Hello,

On Sun, Sep 28, 2008 at 5:28 PM, Boaz Harrosh <bharrosh@...asas.com> wrote:
> Leon Woestenberg wrote:
>> In sg_next(), after following a chain_ptr, a few more checks should be
>> performed.
>> The rare case exists that the first entry in the chained list is a
>> last marker, in case NULL must be returned.
>
> No! the last marker is set on a valid sg entry. Only it's next
> is no longer valid. So the check at the top is for the Next-sg
> not the passed-in-sg. What you thought of is a NULL terminating
> sg-list. The end marker is so to save the extra NULL entry.
>
Ah yes, the lower bit magic. Thanks!

Sorry for the noise.

Regards,
-- 
Leon
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