Replace raw sprintf() and manual buffer arithmetic with sysfs_emit_at(),
which bounds output to PAGE_SIZE.

Signed-off-by: Bradley Morgan <include@grrlz.net>
---
 kernel/cpu.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index f975bb34915b..25d88cf2bb15 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -2857,18 +2857,15 @@ static const struct attribute_group cpuhp_cpu_attr_group = {
 static ssize_t states_show(struct device *dev,
 				 struct device_attribute *attr, char *buf)
 {
-	ssize_t cur, res = 0;
+	ssize_t res = 0;
 	int i;
 
 	mutex_lock(&cpuhp_state_mutex);
 	for (i = CPUHP_OFFLINE; i <= CPUHP_ONLINE; i++) {
 		struct cpuhp_step *sp = cpuhp_get_step(i);
 
-		if (sp->name) {
-			cur = sprintf(buf, "%3d: %s\n", i, sp->name);
-			buf += cur;
-			res += cur;
-		}
+		if (sp->name)
+			res += sysfs_emit_at(buf, res, "%3d: %s\n", i, sp->name);
 	}
 	mutex_unlock(&cpuhp_state_mutex);
 	return res;
-- 
2.53.0