linux-kernel - Re: [PATCH] fix sun partition overflow over 1T

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Message-Id: <1154710590.23655.248.camel@localhost.localdomain>
Date:	Fri, 04 Aug 2006 17:56:30 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Eric Sandeen <esandeen@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix sun partition overflow over 1T

Ar Gwe, 2006-08-04 am 11:22 -0500, ysgrifennodd Eric Sandeen:
> Although sun partition labels aren't supposed to support > 1T, apparently
> linux partition editors will allow up to 2T.  This can cause problems
> in the kernel when these larger partitions are read, due to a signed
> int container.
> 
> num_sectors in the sun_disklabel struct is marked as __u32 in 2.4, and 
> as __be32 in 2.6.  However, this is assigned to a signed int in
> sun_partition():
> 
>                 int num_sectors;
> 
>                 st_sector = be32_to_cpu(p->start_cylinder) * spc;
>                 num_sectors = be32_to_cpu(p->num_sectors);
> 
> Changing num_sectors to an unsigned int avoids this problem.
> 

> Signed-off-by: Eric Sandeen <esandeen@...hat.com>

Acked-by: Alan Cox <alan@...hat.com>

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