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 <[email protected]>
---
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 <[email protected]>
Thanks
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