From: Namjae Jeon <namjae.jeon@samsung.com>
To: gregkh@linuxfoundation.org, sashal@kernel.org
Cc: stable@vger.kernel.org, Namjae Jeon <namjae.jeon@samsung.com>
Subject: [PATCH 5.7.y 1/4] exfat: fix overflow issue in exfat_cluster_to_sector()
Date: Fri, 24 Jul 2020 09:15:41 +0900 [thread overview]
Message-ID: <20200724001544.30862-2-namjae.jeon@samsung.com> (raw)
In-Reply-To: <20200724001544.30862-1-namjae.jeon@samsung.com>
[ 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;
}
--
2.17.1
next prev parent reply other threads:[~2020-07-24 0:21 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200724002112epcas1p24c54808617a5baddef4e4a2f49722866@epcas1p2.samsung.com>
2020-07-24 0:15 ` [PATCH 5.7.y 0/4] exfat stable patches for 5.7.y Namjae Jeon
[not found] ` <CGME20200724002121epcas1p31a4629c7cf9d3b342d18d8f5faf371e2@epcas1p3.samsung.com>
2020-07-24 0:15 ` Namjae Jeon [this message]
[not found] ` <CGME20200724002122epcas1p3611340519231e6d365a603bcec134e39@epcas1p3.samsung.com>
2020-07-24 0:15 ` [PATCH 5.7.y 2/4] exfat: fix wrong hint_stat initialization in exfat_find_dir_entry() Namjae Jeon
[not found] ` <CGME20200724002123epcas1p1ba65569ce62beb1ba94efb38907a798b@epcas1p1.samsung.com>
2020-07-24 0:15 ` [PATCH 5.7.y 3/4] exfat: fix wrong size update of stream entry by typo Namjae Jeon
[not found] ` <CGME20200724002124epcas1p2b7fe53394e20e4dccc23e61e2a82b828@epcas1p2.samsung.com>
2020-07-24 0:15 ` [PATCH 5.7.y 4/4] exfat: fix name_hash computation on big endian systems Namjae Jeon
2020-07-24 3:57 ` [PATCH 5.7.y 0/4] exfat stable patches for 5.7.y Sasha Levin
2020-07-24 4:00 ` Namjae Jeon
2020-07-24 9:42 ` Greg KH
[not found] ` <20200726082152epcms1p54e52279179cea382baf02c4616af315b@epcms1p5>
2020-07-26 14:47 ` FW: " Namjae Jeon
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