diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 6e9259a..81afb39 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -363,15 +363,13 @@
 static ssize_t
 sysfs_show_current_clocksources(struct sys_device *dev, char *buf)
 {
-	char *curr = buf;
+	ssize_t count = 0;
 
 	spin_lock_irq(&clocksource_lock);
-	curr += sprintf(curr, "%s ", curr_clocksource->name);
+	count = snprintf(buf, PAGE_SIZE, "%s\n", curr_clocksource->name);
 	spin_unlock_irq(&clocksource_lock);
 
-	curr += sprintf(curr, "\n");
-
-	return curr - buf;
+	return count;
 }
 
 /**
@@ -439,17 +437,20 @@
 sysfs_show_available_clocksources(struct sys_device *dev, char *buf)
 {
 	struct clocksource *src;
-	char *curr = buf;
+	ssize_t count = 0;
 
 	spin_lock_irq(&clocksource_lock);
 	list_for_each_entry(src, &clocksource_list, list) {
-		curr += sprintf(curr, "%s ", src->name);
+		count += snprintf(buf + count,
+				  max((ssize_t)PAGE_SIZE - count, (ssize_t)0),
+				  "%s ", src->name);
 	}
 	spin_unlock_irq(&clocksource_lock);
 
-	curr += sprintf(curr, "\n");
+	count += snprintf(buf + count,
+			  max((ssize_t)PAGE_SIZE - count, (ssize_t)0), "\n");
 
-	return curr - buf;
+	return count;
 }
 
 /*