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| author | Namjae Jeon <namjae.jeon@samsung.com> | 2020-07-03 11:16:32 +0900 |
|---|---|---|
| committer | Namjae Jeon <namjae.jeon@samsung.com> | 2020-07-21 10:44:06 +0900 |
| commit | 43946b70494beefe40ec1b2ba4744c0f294d7736 (patch) | |
| tree | 70aa76f22938b1d00033ed174e7ea6af7d7aa043 /fs/exfat/exfat_fs.h | |
| parent | ba47d845d715a010f7b51f6f89bae32845e6acb7 (diff) | |
| download | lwn-43946b70494beefe40ec1b2ba4744c0f294d7736.tar.gz lwn-43946b70494beefe40ec1b2ba4744c0f294d7736.zip | |
exfat: fix overflow issue in exfat_cluster_to_sector()
An overflow issue can occur while calculating sector in
exfat_cluster_to_sector(). It needs to cast clus's type to sector_t
before left shifting.
Fixes: 1acf1a564b60 ("exfat: add in-memory and on-disk structures and headers")
Cc: stable@vger.kernel.org # v5.7
Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Diffstat (limited to 'fs/exfat/exfat_fs.h')
| -rw-r--r-- | fs/exfat/exfat_fs.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h index 7579cd3bbadb..75c7bdbeba6d 100644 --- a/fs/exfat/exfat_fs.h +++ b/fs/exfat/exfat_fs.h @@ -371,7 +371,7 @@ static inline bool exfat_is_last_sector_in_cluster(struct exfat_sb_info *sbi, static inline sector_t exfat_cluster_to_sector(struct exfat_sb_info *sbi, unsigned int clus) { - return ((clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits) + + return ((sector_t)(clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits) + sbi->data_start_sector; } |