Re: [Bugme-new] [Bug 34732] New: BUG: unable to handle kernel NULL pointer dereference at 00000020

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On Mon May 09, 2011 at 12:07:07PM -0700, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> I assume this is a post-2.6.38 regression.
> 
> I can't begin to think what might cause this.  Is it reproducible?

I'd bet on e7c0a167860620bd2938366896964f729ddaeaaa

eCryptfs uses lookup_one_len() to lookup lower files, which means that
the lower filesystem's d_revalidate() can get a NULL nameidata pointer.
That commit dropped the check on nd before dereferencing it.

Tyler

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