diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 366a9b615bf0..7ce0fc40aec2 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -1394,6 +1394,10 @@ static int ext4_ioctl_set_tune_sb(struct file *filp,
 	if (copy_from_user(&params, in, sizeof(params)))
 		return -EFAULT;
 
+	if (strnlen(params.mount_opts, sizeof(params.mount_opts)) ==
+	    sizeof(params.mount_opts))
+		return -E2BIG;
+
 	if ((params.set_flags & ~TUNE_OPS_SUPPORTED) != 0)
 		return -EOPNOTSUPP;