linux-kernel - Re: [patch v2] fcntl: return -EFAULT if copy_to

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Message-ID: <4C07990A.8080508@fusionio.com>
Date:	Thu, 03 Jun 2010 13:59:06 +0200
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Dan Carpenter <error27@...il.com>,
	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>,
	Matthew Wilcox <matthew@....cx>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch v2] fcntl: return -EFAULT if copy_to_user fails

On 2010-06-03 12:35, Dan Carpenter wrote:
> copy_to_user() returns the number of bytes remaining, but we want to
> return -EFAULT.
> 	ret = fcntl(fd, F_SETOWN_EX, NULL);
> With the original code ret would be 8 here.
> 
> V2: Takuya Yoshikawa pointed out a similar issue in f_getown_ex()

Pretty basic bug, how long has this been there?

Acked-by: Jens Axboe <jaxboe@...ionio.com>

-- 
Jens Axboe

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