linux-kernel - Re: [PATCH] nfs: check a crash in nfs_lookup

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Message-ID: <20110513103202.GA27578@infradead.org>
Date:	Fri, 13 May 2011 06:32:02 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Peng Huang <shawn.p.huang@...il.com>
Cc:	Trond Myklebust <Trond.Myklebust@...app.com>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nfs: check a crash in nfs_lookup_revalidate

On Wed, May 11, 2011 at 05:03:25PM -0400, Peng Huang wrote:
> lookup_one_len() may call nfs_loopup_revalidate() with nd == NULL
> indirectly, that causes the kernel crash.

lookup_one_len must only be called by a filesystem or a library function
called by the filesystem.  You are not allowed to call it on a random
filesystem like nfs that doesn't support the underlying assumptions.

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