linux-kernel - Re: [Ocfs2-devel] [PATCH] [OCFS2] ocfs2_connection

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Message-ID: <20101118234527.GL19821@mail.oracle.com>
Date:	Thu, 18 Nov 2010 15:45:27 -0800
From:	Joel Becker <Joel.Becker@...cle.com>
To:	dann frazier <dann.frazier@...onical.com>
Cc:	ocfs2-devel@....oracle.com, linux-kernel@...r.kernel.org
Subject: Re: [Ocfs2-devel] [PATCH] [OCFS2] ocfs2_connection_find() returns
 pointer to bad structure

On Thu, Nov 18, 2010 at 03:03:09PM -0700, dann frazier wrote:
> If ocfs2_live_connection_list is empty, ocfs2_connection_find() will return
> a pointer to the LIST_HEAD, cast as a ocfs2_live_connection. This can cause
> an oops when ocfs2_control_send_down() dereferences c->oc_conn:
> 
> Call Trace:
>   [<ffffffffa00c2a3c>] ocfs2_control_message+0x28c/0x2b0 [ocfs2_stack_user]
>   [<ffffffffa00c2a95>] ocfs2_control_write+0x35/0xb0 [ocfs2_stack_user]
>   [<ffffffff81143a88>] vfs_write+0xb8/0x1a0
>   [<ffffffff8155cc13>] ? do_page_fault+0x153/0x3b0
>   [<ffffffff811442f1>] sys_write+0x51/0x80
>   [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b
> 
> Fix by explicitly returning NULL if no match is found.
> 
> Signed-off-by: dann frazier <dann.frazier@...onical.com>

	This patch is now in the fixes branch of ocfs2.git.

Joel

-- 

"I don't even butter my bread; I consider that cooking."
         - Katherine Cebrian

Joel Becker
Senior Development Manager
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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