linux-kernel - [PATCH] f2fs: Cast expression type to unsigned long in __count_extent

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Message-ID: <20240305080943.6922-1-r.smirnov@omp.ru>
Date: Tue, 5 Mar 2024 11:09:43 +0300
From: Roman Smirnov <r.smirnov@....ru>
To: Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>
CC: Roman Smirnov <r.smirnov@....ru>, Sergey Shtylyov <s.shtylyov@....ru>,
	Karina Yankevich <k.yankevich@....ru>,
	<linux-f2fs-devel@...ts.sourceforge.net>, <linux-kernel@...r.kernel.org>,
	<lvc-project@...uxtesting.org>
Subject: [PATCH] f2fs: Cast expression type to unsigned long in __count_extent_cache()

Cast expression type to unsigned long in __count_extent_cache()
to prevent integer overflow.

Found by Linux Verification Center (linuxtesting.org) with Svace.

Signed-off-by: Roman Smirnov <r.smirnov@....ru>
Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>
---
 fs/f2fs/shrinker.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/f2fs/shrinker.c b/fs/f2fs/shrinker.c
index 83d6fb97dcae..bb86a06c5d5e 100644
--- a/fs/f2fs/shrinker.c
+++ b/fs/f2fs/shrinker.c
@@ -33,7 +33,7 @@ static unsigned long __count_extent_cache(struct f2fs_sb_info *sbi,
 {
 	struct extent_tree_info *eti = &sbi->extent_tree[type];
 
-	return atomic_read(&eti->total_zombie_tree) +
+	return (unsigned long)atomic_read(&eti->total_zombie_tree) +
 				atomic_read(&eti->total_ext_node);
 }
 
-- 
2.34.1