vfio: simplify kmalloc+copy_from_user to memdup_user

Generated by: coccinelle/api/memdup_user.cocci

Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

1 files changed, 4 insertions, 9 deletions

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 6c119944bbb6..a4dc21b9cb06 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -327,15 +327,10 @@ static long vfio_pci_ioctl(void *device_data,
                             hdr.count > vfio_pci_get_irq_count(vdev, hdr.index))
                                 return -EINVAL;
 
-                        data = kmalloc(hdr.count * size, GFP_KERNEL);
-                        if (!data)
-                                return -ENOMEM;
-
-                        if (copy_from_user(data, (void __user *)(arg + minsz),
-                                           hdr.count * size)) {
-                                kfree(data);
-                                return -EFAULT;
-                        }
+                        data = memdup_user((void __user *)(arg + minsz),
+                                           hdr.count * size);
+                        if (IS_ERR(data))
+                                return PTR_ERR(data);
                 }
 
                 mutex_lock(&vdev->igate);