Re: [PATCH] md/raid1-10: fix casting from randomized structure in raid1_submit_write()

[Song Liu]

On Thu, Jun 15, 2023 at 6:26 PM Yu Kuai <yukuai1@xxxxxxxxxxxxxxx> wrote:
>
> From: Yu Kuai <yukuai3@xxxxxxxxxx>
>
> Following build error triggered while build with clang version 17.0.0
> with W=1(this can't be reporduced with gcc 13.1.0):
>
> drivers/md/raid1-10.c:117:25: error: casting from randomized structure
> pointer type 'struct block_device *' to 'struct md_rdev *'
>      117 |         struct md_rdev *rdev = (struct md_rdev *)bio->bi_bdev;
>          |                                ^
>
> Fix this by casting 'bio->bi_bdev' to 'void *', as it used to be.
>
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Link: https://lore.kernel.org/oe-kbuild-all/202306142042.fmjfmTF8-lkp@xxxxxxxxx/
> Fixes: 8295efbe68c0 ("md/raid1-10: factor out a helper to submit normal write")
> Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>

Applied to md-next.

Thanks,
Song

> ---
>  drivers/md/raid1-10.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c
> index 169ebe296f2d..3f22edec70e7 100644
> --- a/drivers/md/raid1-10.c
> +++ b/drivers/md/raid1-10.c
> @@ -116,7 +116,7 @@ static void md_bio_reset_resync_pages(struct bio *bio, struct resync_pages *rp,
>
>  static inline void raid1_submit_write(struct bio *bio)
>  {
> -       struct md_rdev *rdev = (struct md_rdev *)bio->bi_bdev;
> +       struct md_rdev *rdev = (void *)bio->bi_bdev;
>
>         bio->bi_next = NULL;
>         bio_set_dev(bio, rdev->bdev);
> --
> 2.39.2
>