[ Upstream commit 43946b70494beefe40ec1b2ba4744c0f294d7736 ]
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 --- 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 d865050fa6cd..99e9baf2d31d 100644 --- a/fs/exfat/exfat_fs.h +++ b/fs/exfat/exfat_fs.h @@ -375,7 +375,7 @@ 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; }