linux-kernel - Re: NULL pointer due to malformed bcache bio

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Message-ID: <20130423163551.GA9958@redhat.com>
Date:	Tue, 23 Apr 2013 12:35:51 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, axboe@...nel.dk
Subject: Re: NULL pointer due to malformed bcache bio

On Mon, Apr 22 2013 at  5:22pm -0400,
Kent Overstreet <koverstreet@...gle.com> wrote:

> On Wed, Apr 10, 2013 at 04:54:40PM -0400, Mike Snitzer wrote:
> > Hey,
> > 
> > So DM core clearly needs to be more defensive about the possibility for
> > a NULL return from bio_alloc_bioset() given I'm hitting a NULL pointer
> > in DM's alloc_tio() because nr_iovecs=512.  bio_alloc_bioset()'s call to
> > bvec_alloc() only supports nr_iovecs up to BIO_MAX_PAGES (256).
> 
> I have a fix for this queued up in my bcache-for-upstream, if you want
> to check and make sure it works.

Works for me, thanks.
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