On 2020/9/9 ??11:41, Li Qiang wrote:> Free the 'page_list' when the 'npages' is zero.
>
> Signed-off-by: Li Qiang <liq3ea at 163.com>
> ---
> drivers/vhost/vdpa.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index 3fab94f88894..6a9fcaf1831d 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -609,8 +609,10 @@ static int vhost_vdpa_process_iotlb_update(struct
vhost_vdpa *v,
> gup_flags |= FOLL_WRITE;
>
> npages = PAGE_ALIGN(msg->size + (iova & ~PAGE_MASK)) >>
PAGE_SHIFT;
> - if (!npages)
> - return -EINVAL;
> + if (!npages) {
> + ret = -EINVAL;
> + goto free_page;
> + }
>
> mmap_read_lock(dev->mm);
>
> @@ -666,6 +668,8 @@ static int vhost_vdpa_process_iotlb_update(struct
vhost_vdpa *v,
> atomic64_sub(npages, &dev->mm->pinned_vm);
> }
> mmap_read_unlock(dev->mm);
> +
> +free_page:
> free_page((unsigned long)page_list);
> return ret;
> }
Cc: stable at vger.kernel.org
Acked-by: Jason Wang <jasowang at redhat.com>