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From:   Christoph Hellwig <hch@lst.de>
To:     Jens Axboe <axboe@kernel.dk>
Cc:     Coly Li <colyli@suse.de>, Mike Snitzer <snitzer@redhat.com>,
        Song Liu <song@kernel.org>, David Sterba <dsterba@suse.com>,
        Josef Bacik <josef@toxicpanda.com>,
        "Theodore Ts'o" <tytso@mit.edu>,
        OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
        Dave Kleikamp <shaggy@kernel.org>,
        Ryusuke Konishi <konishi.ryusuke@gmail.com>,
        Anton Altaparmakov <anton@tuxera.com>,
        Konstantin Komarov <almaz.alexandrovich@paragon-software.com>,
        Kees Cook <keescook@chromium.org>,
        Phillip Lougher <phillip@squashfs.org.uk>,
        Jan Kara <jack@suse.com>, linux-block@vger.kernel.org,
        dm-devel@redhat.com, drbd-dev@lists.linbit.com,
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        linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org,
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        ntfs3@lists.linux.dev, reiserfs-devel@vger.kernel.org
Subject: [PATCH 23/30] squashfs: use bdev_nr_bytes instead of open coding it
Date:   Mon, 18 Oct 2021 12:11:23 +0200
Message-Id: <20211018101130.1838532-24-hch@lst.de>
In-Reply-To: <20211018101130.1838532-1-hch@lst.de>
References: <20211018101130.1838532-1-hch@lst.de>
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Use the proper helper to read the block device size.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Phillip Lougher <phillip@squashfs.org.uk>
---
 fs/squashfs/super.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index 60d6951915f44..bb44ff4c5cc67 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -16,6 +16,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/blkdev.h>
 #include <linux/fs.h>
 #include <linux/fs_context.h>
 #include <linux/fs_parser.h>
@@ -179,8 +180,8 @@ static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
 	/* Check the filesystem does not extend beyond the end of the
 	   block device */
 	msblk->bytes_used = le64_to_cpu(sblk->bytes_used);
-	if (msblk->bytes_used < 0 || msblk->bytes_used >
-			i_size_read(sb->s_bdev->bd_inode))
+	if (msblk->bytes_used < 0 ||
+	    msblk->bytes_used > bdev_nr_bytes(sb->s_bdev))
 		goto failed_mount;
 
 	/* Check block size for sanity */
-- 
2.30.2