int build_segment_manager(struct f2fs_sb_info *sbi)
{
	struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
	struct f2fs_sm_info *sm_info;
	int err;

	sm_info = kzalloc(sizeof(struct f2fs_sm_info), GFP_KERNEL);
	if (!sm_info)
		return -ENOMEM;

	/* init sm info */
	sbi->sm_info = sm_info;
	sm_info->seg0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr);
	sm_info->main_blkaddr = le32_to_cpu(raw_super->main_blkaddr);
	sm_info->segment_count = le32_to_cpu(raw_super->segment_count);
	sm_info->reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count);
	sm_info->ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
	sm_info->main_segments = le32_to_cpu(raw_super->segment_count_main);
	sm_info->ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
	sm_info->rec_prefree_segments = sm_info->main_segments *
					DEF_RECLAIM_PREFREE_SEGMENTS / 100;
	if (sm_info->rec_prefree_segments > DEF_MAX_RECLAIM_PREFREE_SEGMENTS)
		sm_info->rec_prefree_segments = DEF_MAX_RECLAIM_PREFREE_SEGMENTS;

	if (!test_opt(sbi, LFS))
		sm_info->ipu_policy = 1 << F2FS_IPU_FSYNC;
	sm_info->min_ipu_util = DEF_MIN_IPU_UTIL;
	sm_info->min_fsync_blocks = DEF_MIN_FSYNC_BLOCKS;
	sm_info->min_hot_blocks = DEF_MIN_HOT_BLOCKS;

	sm_info->trim_sections = DEF_BATCHED_TRIM_SECTIONS;

	INIT_LIST_HEAD(&sm_info->sit_entry_set);

	if (!f2fs_readonly(sbi->sb)) {
		err = create_flush_cmd_control(sbi);
		if (err)
			return err;
	}

	err = create_discard_cmd_control(sbi);
	if (err)
		return err;

	err = build_sit_info(sbi);
	if (err)
		return err;
	err = build_free_segmap(sbi);
	if (err)
		return err;
	err = build_curseg(sbi);
	if (err)
		return err;

	/* reinit free segmap based on SIT */
	build_sit_entries(sbi);

	init_free_segmap(sbi);
	err = build_dirty_segmap(sbi);
	if (err)
		return err;

	init_min_max_mtime(sbi);
	return 0;
}
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.