linux-kernel - [PATCH AUTOSEL 6.0 17/18] exfat: fix overflow in sector and cluster conversion

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Date:   Fri, 23 Dec 2022 20:30:33 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yuezhang Mo <Yuezhang.Mo@...y.com>,
        Sungjong Seo <sj1557.seo@...sung.com>,
        Namjae Jeon <linkinjeon@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-fsdevel@...r.kernel.org
Subject: [PATCH AUTOSEL 6.0 17/18] exfat: fix overflow in sector and cluster conversion

From: Yuezhang Mo <Yuezhang.Mo@...y.com>

[ Upstream commit 40306b4d1ba25970dafd53432e8daa5d591ebd99 ]

According to the exFAT specification, there are at most 2^32-11
clusters in a volume. so using 'int' is not enough for cluster
index, the return value type of exfat_sector_to_cluster() should
be 'unsigned int'.

Signed-off-by: Yuezhang Mo <Yuezhang.Mo@...y.com>
Reviewed-by: Sungjong Seo <sj1557.seo@...sung.com>
Signed-off-by: Namjae Jeon <linkinjeon@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/exfat/exfat_fs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h
index a8f8eee4937c..7f6b1d5bceab 100644
--- a/fs/exfat/exfat_fs.h
+++ b/fs/exfat/exfat_fs.h
@@ -375,7 +375,7 @@ static inline sector_t exfat_cluster_to_sector(struct exfat_sb_info *sbi,
 		sbi->data_start_sector;
 }
 
-static inline int exfat_sector_to_cluster(struct exfat_sb_info *sbi,
+static inline unsigned int exfat_sector_to_cluster(struct exfat_sb_info *sbi,
 		sector_t sec)
 {
 	return ((sec - sbi->data_start_sector) >> sbi->sect_per_clus_bits) +
-- 
2.35.1