From 49c3f649d3d28b06851b1d250761532a8b7cc3c2 Mon Sep 17 00:00:00 2001
From: Andrew Morton <akpm@linux-foundation.org>
Date: Thu, 2 Jun 2022 11:41:39 -0700
Subject: [PATCH] mm-shrinkers-add-scan-interface-for-shrinker-debugfs-fix-fix

fix arg count checking

Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Kent Overstreet <kent.overstreet@gmail.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/shrinker_debug.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/shrinker_debug.c b/mm/shrinker_debug.c
index 12026472daae..e5b40c43221d 100644
--- a/mm/shrinker_debug.c
+++ b/mm/shrinker_debug.c
@@ -124,7 +124,7 @@ static ssize_t shrinker_debugfs_scan_write(struct file *file,
 		return -EFAULT;
 	kbuf[read_len] = '\0';
 
-	if (sscanf(kbuf, "%lu %d %lu", &ino, &nid, &nr_to_scan) != 2)
+	if (sscanf(kbuf, "%lu %d %lu", &ino, &nid, &nr_to_scan) != 3)
 		return -EINVAL;
 
 	if (nid < 0 || nid >= nr_node_ids)
-- 
2.50.1