* [PATCH] vhost_vdpa: return -EFAULT if copy_to_user() fails
@ 2020-12-02 6:44 Dan Carpenter
2020-12-02 8:13 ` Jason Wang
2020-12-02 9:14 ` Stefano Garzarella
0 siblings, 2 replies; 3+ messages in thread
From: Dan Carpenter @ 2020-12-02 6:44 UTC (permalink / raw)
To: Michael S. Tsirkin, Jason Wang; +Cc: kvm, virtualization, kernel-janitors
The copy_to_user() function returns the number of bytes remaining to be
copied but this should return -EFAULT to the user.
Fixes: 1b48dc03e575 ("vhost: vdpa: report iova range")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
drivers/vhost/vdpa.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index d6a37b66770b..ef688c8c0e0e 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -344,7 +344,9 @@ static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp)
.last = v->range.last,
};
- return copy_to_user(argp, &range, sizeof(range));
+ if (copy_to_user(argp, &range, sizeof(range)))
+ return -EFAULT;
+ return 0;
}
static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
--
2.29.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] vhost_vdpa: return -EFAULT if copy_to_user() fails
2020-12-02 6:44 [PATCH] vhost_vdpa: return -EFAULT if copy_to_user() fails Dan Carpenter
@ 2020-12-02 8:13 ` Jason Wang
2020-12-02 9:14 ` Stefano Garzarella
1 sibling, 0 replies; 3+ messages in thread
From: Jason Wang @ 2020-12-02 8:13 UTC (permalink / raw)
To: Dan Carpenter, Michael S. Tsirkin; +Cc: kvm, virtualization, kernel-janitors
On 2020/12/2 下午2:44, Dan Carpenter wrote:
> The copy_to_user() function returns the number of bytes remaining to be
> copied but this should return -EFAULT to the user.
>
> Fixes: 1b48dc03e575 ("vhost: vdpa: report iova range")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
> drivers/vhost/vdpa.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index d6a37b66770b..ef688c8c0e0e 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -344,7 +344,9 @@ static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp)
> .last = v->range.last,
> };
>
> - return copy_to_user(argp, &range, sizeof(range));
> + if (copy_to_user(argp, &range, sizeof(range)))
> + return -EFAULT;
> + return 0;
> }
>
> static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
Acked-by: Jason Wang <jasowang@redhat.com>
Thanks
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] vhost_vdpa: return -EFAULT if copy_to_user() fails
2020-12-02 6:44 [PATCH] vhost_vdpa: return -EFAULT if copy_to_user() fails Dan Carpenter
2020-12-02 8:13 ` Jason Wang
@ 2020-12-02 9:14 ` Stefano Garzarella
1 sibling, 0 replies; 3+ messages in thread
From: Stefano Garzarella @ 2020-12-02 9:14 UTC (permalink / raw)
To: Dan Carpenter
Cc: Michael S. Tsirkin, Jason Wang, kernel-janitors, kvm, virtualization
On Wed, Dec 02, 2020 at 09:44:43AM +0300, Dan Carpenter wrote:
>The copy_to_user() function returns the number of bytes remaining to be
>copied but this should return -EFAULT to the user.
>
>Fixes: 1b48dc03e575 ("vhost: vdpa: report iova range")
>Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>---
> drivers/vhost/vdpa.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
>
>diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
>index d6a37b66770b..ef688c8c0e0e 100644
>--- a/drivers/vhost/vdpa.c
>+++ b/drivers/vhost/vdpa.c
>@@ -344,7 +344,9 @@ static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp)
> .last = v->range.last,
> };
>
>- return copy_to_user(argp, &range, sizeof(range));
>+ if (copy_to_user(argp, &range, sizeof(range)))
>+ return -EFAULT;
>+ return 0;
> }
>
> static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
>--
>2.29.2
>
>_______________________________________________
>Virtualization mailing list
>Virtualization@lists.linux-foundation.org
>https://lists.linuxfoundation.org/mailman/listinfo/virtualization
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-12-02 6:44 [PATCH] vhost_vdpa: return -EFAULT if copy_to_user() fails Dan Carpenter
2020-12-02 8:13 ` Jason Wang
2020-12-02 9:14 ` Stefano Garzarella
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