Merge tag 'squashfs-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-next

Pull squashfs updates from Phillip Lougher:
 "Add an extra mount time sanity check, plus some code cleanups and bug
  fixes."

* tag 'squashfs-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-next:
  Squashfs: add mount time sanity check for block_size and block_log match
  Squashfs: fix f_pos check in get_dir_index_using_offset
  Squashfs: get rid of obsolete definitions in header file
  Squashfs: remove redundant length initialisation in squashfs_lookup
  Squashfs: remove redundant length initialisation in squashfs_readdir
  Squashfs: update comment removing reference to zlib only
  Squashfs: use define instead of constant

fs/squashfs/super.c

@@ -158,10 +158,15 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
 		goto failed_mount;
 	}
 
+	/* Check block log for sanity */
 	msblk->block_log = le16_to_cpu(sblk->block_log);
 	if (msblk->block_log > SQUASHFS_FILE_MAX_LOG)
 		goto failed_mount;
 
+	/* Check that block_size and block_log match */
+	if (msblk->block_size != (1 << msblk->block_log))
+		goto failed_mount;
+
 	/* Check the root inode for sanity */
 	root_inode = le64_to_cpu(sblk->root_inode);
 	if (SQUASHFS_INODE_OFFSET(root_inode) > SQUASHFS_METADATA_SIZE)