linux-kernel - Re: [PATCH] DLM: fix a couple of races

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Date:	Fri, 4 May 2007 13:17:23 -0500
From:	David Teigland <teigland@...hat.com>
To:	Satyam Sharma <ssatyam@....iitk.ac.in>
Cc:	linux-kernel@...r.kernel.org, linux-cluster@...hat.com,
	joel.becker@...cle.com, swhiteho@...hat.com
Subject: Re: [PATCH] DLM: fix a couple of races

On Fri, May 04, 2007 at 09:49:45PM +0530, Satyam Sharma wrote:
> Hi,
> 
> There are the following two trivially-fixed races in fs/dlm/config.c:
> 
> 1. The configfs subsystem semaphore must be held by the caller when 
> calling config_group_find_obj(). It's needed to walk the subsystem 
> hierarchy without racing with a simultaneous mkdir(2) or rmdir(2). I 
> looked around to see if there was some other way we were avoiding this 
> race, but couldn't find any.
> 
> 2. get_comm() does hold the subsystem semaphore but lets go too soon -- 
> before grabbing a reference on the found config_item. A concurrent 
> rmdir(2) could come and release the comm after the up() but before the 
> config_item_get().
> 
> Patch that fixes both these bugs below.

Thanks, Steve should be able to throw this into one of his git trees.

Dave

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