On Tue, May 30, 2023 at 8:50 AM Johannes Thumshirn
wrote:
>
> alloc_behind_master_bio() can possibly add multiple pages to a bio, but it
> is not checking for the return value of bio_add_page() if adding really
> succeeded.
>
> Check if the page adding succeeded and if not bail out.
>
> Reviewed-by: Damien Le Moal
> Signed-off-by: Johannes Thumshirn
Acked-by: Song Liu
> ---
> drivers/md/raid1.c | 5 -
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
> index 68a9e2d9985b..8283ef177f6c 100644
> --- a/drivers/md/raid1.c
> +++ b/drivers/md/raid1.c
> @@ -1147,7 +1147,10 @@ static void alloc_behind_master_bio(struct r1bio
> *r1_bio,
> if (unlikely(!page))
> goto free_pages;
>
> - bio_add_page(behind_bio, page, len, 0);
> + if (!bio_add_page(behind_bio, page, len, 0)) {
> + free_page(page);
> + goto free_pages;
> + }
>
> size -= len;
> i++;
> --
> 2.40.1
>
