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BACKPORT: exfat: fix overflow for large capacity partition

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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.

Bug: 254441685
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>
(cherry picked from commit 2e9ceb6728)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I0ebd4d6d3ac9e0e5b50f58a62e5b49ef4959b3e3
This commit is contained in:
Yuezhang Mo
2022-07-28 10:01:26 +08:00
committed by Treehugger Robot
parent 0e47e246cf
commit 90e5478437
1 changed files with 1 additions and 2 deletions
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fs/exfat/fatent.c
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@@ -228,8 +228,7 @@ int exfat_zeroed_cluster(struct inode *dir, unsigned int clu)
struct exfat_sb_info *sbi = EXFAT_SB(sb);
struct buffer_head *bh;
struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
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;