diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index fe960d5e8913..49a02bf091ae 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2176,6 +2176,7 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
 	vol = memdup_user((void __user *)arg, sizeof(*vol));
 	if (IS_ERR(vol))
 		return PTR_ERR(vol);
+	vol->name[BTRFS_PATH_NAME_MAX] = '\0';
 
 	switch (cmd) {
 	case BTRFS_IOC_SCAN_DEV: