linux-kernel - Re: [patch] fuse: fix permission checking

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Date:	Fri, 15 Feb 2008 12:35:38 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: Re: [patch] fuse: fix permission checking

On Fri, 2008-02-15 at 11:23 +0100, Miklos Szeredi wrote:
> This is for 2.6.25 and 2.6.24.y, but NOT for 2.6.23.y.
> 
> Thanks,
> Miklos
> ----
> 
> From: Miklos Szeredi <mszeredi@...e.cz>
> 
> I added a nasty local variable shadowing bug to fuse in 2.6.24, with
> the result, that the 'default_permissions' mount option is basically
> ignored.
> 
> How did this happen?
> 
>  - old err declaration in inner scope
>  - new err getting declared in outer scope
>  - 'return err' from inner scope getting removed
>  - old declaration not being noticed
> 
> -Wshadow would have saved us, but it doesn't seem practical for
> the kernel :(
> 
> More testing would have also saved us :((

sparse would have saved you too.

Harvey

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