Re: [PATCH] direct-io: Prevent NULL pointer access in submit_page_section

[Al Viro]

On Mon, Oct 09, 2017 at 11:13:18AM +0200, Andreas Gruenbacher wrote:
> In the code added to function submit_page_section by commit b1058b981,
> sdio->bio can currently be NULL when calling dio_bio_submit.  This then
> leads to a NULL pointer access in dio_bio_submit, so check for a NULL
> bio in submit_page_section before trying to submit it instead.
> 
> Fixes xfstest generic/250 on gfs2.
> 
> Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
> Reviewed-by: Jan Kara <jack@xxxxxxx>

How far back in -stable should it go?  I'm fine with the patch, but I'd
rather have accurate Cc: stable in commit message...