diff mbox series

[23/30] squashfs: use bdev_nr_bytes instead of open coding it

Message ID 20211015132643.1621913-24-hch@lst.de (mailing list archive)
State New, archived
Headers show
Series [01/30] block: move the SECTOR_SIZE related definitions to blk_types.h | expand

Commit Message

Christoph Hellwig Oct. 15, 2021, 1:26 p.m. UTC 
Use the proper helper to read the block device size.

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

Comments

Kees Cook Oct. 15, 2021, 4:57 p.m. UTC | #1 
On Fri, Oct 15, 2021 at 03:26:36PM +0200, Christoph Hellwig wrote:
> 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>
diff mbox series

Patch

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 */