diff --git a/fs/inotify.c b/fs/inotify.c
index 807209f..b55d6e4 100644
--- a/fs/inotify.c
+++ b/fs/inotify.c
@@ -929,6 +929,12 @@
 	if (unlikely(!filp))
 		return -EBADF;
 
+	/* verify that this is indeed an inotify instance */
+	if (unlikely(filp->f_op != &inotify_fops)) {
+		ret = -EINVAL;
+		goto fput_and_out;
+	}
+
 	ret = find_inode(path, &nd);
 	if (unlikely(ret))
 		goto fput_and_out;
@@ -986,10 +992,18 @@
 	filp = fget_light(fd, &fput_needed);
 	if (unlikely(!filp))
 		return -EBADF;
+
+	/* verify that this is indeed an inotify instance */
+	if (unlikely(filp->f_op != &inotify_fops)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
 	dev = filp->private_data;
 	ret = inotify_ignore(dev, wd);
-	fput_light(filp, fput_needed);
 
+out:
+	fput_light(filp, fput_needed);
 	return ret;
 }