linux-kernel - [PATCH 5.15 020/917] exfat: fix incorrect loading of i

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Date:   Mon, 15 Nov 2021 17:51:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ganapathi Kamath <hgkamath@...mail.com>,
        Sungjong Seo <sj1557.seo@...sung.com>,
        Namjae Jeon <linkinjeon@...nel.org>
Subject: [PATCH 5.15 020/917] exfat: fix incorrect loading of i_blocks for large files

From: Sungjong Seo <sj1557.seo@...sung.com>

commit 0c336d6e33f4bedc443404c89f43c91c8bd9ee11 upstream.

When calculating i_blocks, there was a mistake that was masked with a
32-bit variable. So i_blocks for files larger than 4 GiB had incorrect
values. Mask with a 64-bit variable instead of 32-bit one.

Fixes: 5f2aa075070c ("exfat: add inode operations")
Cc: stable@...r.kernel.org # v5.7+
Reported-by: Ganapathi Kamath <hgkamath@...mail.com>
Signed-off-by: Sungjong Seo <sj1557.seo@...sung.com>
Signed-off-by: Namjae Jeon <linkinjeon@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/exfat/inode.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/exfat/inode.c
+++ b/fs/exfat/inode.c
@@ -604,7 +604,7 @@ static int exfat_fill_inode(struct inode
 	exfat_save_attr(inode, info->attr);
 
 	inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1)) &
-		~(sbi->cluster_size - 1)) >> inode->i_blkbits;
+		~((loff_t)sbi->cluster_size - 1)) >> inode->i_blkbits;
 	inode->i_mtime = info->mtime;
 	inode->i_ctime = info->mtime;
 	ei->i_crtime = info->crtime;