[PATCH] direct-io: fix use after free

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Hi,

i've sent exactly the same fix a while ago in the linux-block,
here it is:

https://lkml.org/lkml/2016/1/30/146

On Tue, Mar 08, 2016 at 06:52:58PM -0900, Kent Overstreet wrote:
> Signed-off-by: Kent Overstreet <kent.overstreet@xxxxxxxxx>
> ---
>  fs/direct-io.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/direct-io.c b/fs/direct-io.c
> index 1b2f7ffc8b..d6a9012d42 100644
> --- a/fs/direct-io.c
> +++ b/fs/direct-io.c
> @@ -472,8 +472,8 @@ static int dio_bio_complete(struct dio *dio, struct bio *bio)
>  		dio->io_error = -EIO;
>  
>  	if (dio->is_async && dio->rw == READ && dio->should_dirty) {
> -		bio_check_pages_dirty(bio);	/* transfers ownership */
>  		err = bio->bi_error;
> +		bio_check_pages_dirty(bio);	/* transfers ownership */
>  	} else {
>  		bio_for_each_segment_all(bvec, bio, i) {
>  			struct page *page = bvec->bv_page;
> -- 
> 2.7.0
> 
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