1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
index 2784f91896db..160cb27e120c 100644
--- a/drivers/firewire/fw-cdev.c
+++ b/drivers/firewire/fw-cdev.c
@@ -742,9 +742,17 @@ static void release_descriptor(struct client *client,
 static int ioctl_add_descriptor(struct client *client, void *buffer)
 {
         struct fw_cdev_add_descriptor *request = buffer;
+        struct fw_card *card = client->device->card;
         struct descriptor_resource *r;
         int ret;
 
+        /* Access policy: Allow this ioctl only on local nodes' device files. */
+        spin_lock_irq(&card->lock);
+        ret = client->device->node_id != card->local_node->node_id;
+        spin_unlock_irq(&card->lock);
+        if (ret)
+                return -ENOSYS;
+
         if (request->length > 256)
                 return -EINVAL;