1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
index 75388641a7d3..06471302200f 100644
--- a/drivers/firewire/fw-cdev.c
+++ b/drivers/firewire/fw-cdev.c
@@ -722,10 +722,11 @@ static int ioctl_queue_iso(struct client *client, void *buffer)
                 buffer_end = 0;
         }
 
-        if (!access_ok(VERIFY_READ, request->packets, request->size))
+        p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
+
+        if (!access_ok(VERIFY_READ, p, request->size))
                 return -EFAULT;
 
-        p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
         end = (void __user *)p + request->size;
         count = 0;
         while (p < end) {