linux-kernel - Re: [patch 2/2] r/o bind mounts: Accept passing a mnt NULL pointer to mnt_drop

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Message-ID: <20071013112502.GA11464@infradead.org>
Date:	Sat, 13 Oct 2007 12:25:02 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Jan Blunck <jblunck@...e.de>
Cc:	Dave Hansen <haveblue@...ibm.com>,
	Linux-Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [patch 2/2] r/o bind mounts: Accept passing a mnt NULL pointer to mnt_drop_write()

On Fri, Oct 12, 2007 at 05:50:21PM +0200, Jan Blunck wrote:
> In case of somebody opens a file with dentry_open(dentry, NULL, ...) we don't
> want to stumble on the NULL pointer mnt in struct file.

We should just not allow a NULL vfsmount in dentry_open.  Dave and I have
fixes for reiserfs, and I'll look at the uml use.

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