diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 74fef1f49c35..fc468d1079c2 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -1704,6 +1704,10 @@ static ssize_t btrfs_devinfo_scrub_speed_max_store(struct kobject *kobj,
 	unsigned long long limit;
 
 	limit = memparse(buf, &endptr);
+	/* There could be trailing '\n', also catch any typos after the value. */
+	endptr = skip_spaces(endptr);
+	if (*endptr != 0)
+		return -EINVAL;
 	WRITE_ONCE(device->scrub_speed_max, limit);
 	return len;
 }