1 files changed, 16 insertions, 2 deletions

diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index f9941a769738..baf348834b66 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -106,7 +106,7 @@ free_and_exit:
 static int dev_whitelist_add(struct dev_cgroup *dev_cgroup,
                         struct dev_whitelist_item *wh)
 {
-        struct dev_whitelist_item *whcopy;
+        struct dev_whitelist_item *whcopy, *walk;
 
         whcopy = kmalloc(sizeof(*whcopy), GFP_KERNEL);
         if (!whcopy)
@@ -114,7 +114,21 @@ static int dev_whitelist_add(struct dev_cgroup *dev_cgroup,
 
         memcpy(whcopy, wh, sizeof(*whcopy));
         spin_lock(&dev_cgroup->lock);
-        list_add_tail(&whcopy->list, &dev_cgroup->whitelist);
+        list_for_each_entry(walk, &dev_cgroup->whitelist, list) {
+                if (walk->type != wh->type)
+                        continue;
+                if (walk->major != wh->major)
+                        continue;
+                if (walk->minor != wh->minor)
+                        continue;
+
+                walk->access |= wh->access;
+                kfree(whcopy);
+                whcopy = NULL;
+        }
+
+        if (whcopy != NULL)
+                list_add_tail(&whcopy->list, &dev_cgroup->whitelist);
         spin_unlock(&dev_cgroup->lock);
         return 0;
 }