[dm-devel] NULL pointer due to malformed bcache bio

[Mike Snitzer]

On Mon, Apr 22 2013 at  5:22pm -0400,
Kent Overstreet <koverstreet at google.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.