1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
index a1637a86da3d..d48fa1c23a77 100644
--- a/drivers/firewire/fw-cdev.c
+++ b/drivers/firewire/fw-cdev.c
@@ -1245,6 +1245,10 @@ static int ioctl_send_broadcast_request(struct client *client, void *buffer)
                 return -EINVAL;
         }
 
+        /* Security policy: Only allow accesses to Units Space. */
+        if (request->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
+                return -EACCES;
+
         return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100);
 }