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exfat: fix overflow for large capacity partition 

Using int type for sector index, there will be overflow in a large
capacity partition.

For example, if storage with sector size of 512 bytes and partition
capacity is larger than 2TB, there will be overflow.

Fixes: 1b61383854 ("exfat: reduce block requests when zeroing a cluster")
Cc: stable@vger.kernel.org # v5.19+
Signed-off-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Reviewed-by: Andy Wu <Andy.Wu@sony.com>
Reviewed-by: Aoyama Wataru <wataru.aoyama@sony.com>
Acked-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Yuezhang Mo 2022-07-28 10:01:26 +08:00 committed by Namjae Jeon
parent 4c612826be
commit 2e9ceb6728
1 changed files with 1 additions and 2 deletions
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3
fs/exfat/fatent.c
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@ -270,8 +270,7 @@ int exfat_zeroed_cluster(struct inode *dir, unsigned int clu)
struct super_block *sb = dir->i_sb;
struct exfat_sb_info *sbi = EXFAT_SB(sb);
struct buffer_head *bh;
sector_t blknr, last_blknr;
int i;
sector_t blknr, last_blknr, i;
blknr = exfat_cluster_to_sector(sbi, clu);
last_blknr = blknr + sbi->sect_per_clus;