linux-kernel - [PATCH] erofs: fix potential return value overflow of z_erofs_shrink

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Message-ID: <20250114040058.459981-1-hsiangkao@linux.alibaba.com>
Date: Tue, 14 Jan 2025 12:00:58 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: linux-erofs@...ts.ozlabs.org
Cc: LKML <linux-kernel@...r.kernel.org>,
	Gao Xiang <hsiangkao@...ux.alibaba.com>
Subject: [PATCH] erofs: fix potential return value overflow of z_erofs_shrink_scan()

z_erofs_shrink_scan() could return small numbers due to the mistyped
`freed`.

Although I don't think it has any visible impact.

Fixes: 3883a79abd02 ("staging: erofs: introduce VLE decompression support")
Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
---
 fs/erofs/zdata.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 8bafc4d9edbe..057d68eaa5d2 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -915,8 +915,7 @@ unsigned long z_erofs_shrink_scan(struct erofs_sb_info *sbi,
 				  unsigned long nr_shrink)
 {
 	struct z_erofs_pcluster *pcl;
-	unsigned int freed = 0;
-	unsigned long index;
+	unsigned long index, freed = 0;
 
 	xa_lock(&sbi->managed_pslots);
 	xa_for_each(&sbi->managed_pslots, index, pcl) {
-- 
2.43.5