[dm-devel] NULL pointer due to malformed bcache bio
Kent Overstreet
koverstreet at google.com
Mon Apr 22 21:22:18 UTC 2013
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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