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

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Message-ID: <20130422212218.GA4704@localhost>
Date:	Mon, 22 Apr 2013 14:22:18 -0700
From:	Kent Overstreet <koverstreet@...gle.com>
To:	Mike Snitzer <snitzer@...hat.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 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.
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