ieee1394: video1394: Use memdup_user

...when user data is immediately copied into the allocated region.
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (changelog)

drivers/ieee1394/video1394.c

@@ -1045,14 +1045,9 @@ static long video1394_ioctl(struct file *file,
 			if (get_user(qv, &p->packet_sizes))
 				return -EFAULT;
 
-			psizes = kmalloc(buf_size, GFP_KERNEL);
-			if (!psizes)
-				return -ENOMEM;
-
-			if (copy_from_user(psizes, qv, buf_size)) {
-				kfree(psizes);
-				return -EFAULT;
-			}
+			psizes = memdup_user(qv, buf_size);
+			if (IS_ERR(psizes))
+				return PTR_ERR(psizes);
 		}
 
 		spin_lock_irqsave(&d->lock,flags);