 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
 			       struct kernel_lb_addr *fileset)
 {
 	struct logicalVolDesc *lvd;
	int i, offset;
 	uint8_t type;
 	struct udf_sb_info *sbi = UDF_SB(sb);
 	struct genericPartitionMap *gpm;
	uint16_t ident;
	struct buffer_head *bh;
	unsigned int table_len;
	int ret = 0;

	bh = udf_read_tagged(sb, block, block, &ident);
	if (!bh)
		return 1;
	BUG_ON(ident != TAG_IDENT_LVD);
	lvd = (struct logicalVolDesc *)bh->b_data;
	table_len = le32_to_cpu(lvd->mapTableLength);
	if (sizeof(*lvd) + table_len > sb->s_blocksize) {
		udf_err(sb, "error loading logical volume descriptor: "
			"Partition table too long (%u > %lu)\n", table_len,
			sb->s_blocksize - sizeof(*lvd));
		goto out_bh;
	}

	ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
	if (ret)
		goto out_bh;

	for (i = 0, offset = 0;
	     i < sbi->s_partitions && offset < table_len;
	     i++, offset += gpm->partitionMapLength) {
		struct udf_part_map *map = &sbi->s_partmaps[i];
		gpm = (struct genericPartitionMap *)
				&(lvd->partitionMaps[offset]);
		type = gpm->partitionMapType;
		if (type == 1) {
			struct genericPartitionMap1 *gpm1 =
				(struct genericPartitionMap1 *)gpm;
			map->s_partition_type = UDF_TYPE1_MAP15;
			map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
			map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
			map->s_partition_func = NULL;
		} else if (type == 2) {
			struct udfPartitionMap2 *upm2 =
						(struct udfPartitionMap2 *)gpm;
			if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
						strlen(UDF_ID_VIRTUAL))) {
				u16 suf =
					le16_to_cpu(((__le16 *)upm2->partIdent.
							identSuffix)[0]);
				if (suf < 0x0200) {
					map->s_partition_type =
							UDF_VIRTUAL_MAP15;
					map->s_partition_func =
							udf_get_pblock_virt15;
				} else {
					map->s_partition_type =
							UDF_VIRTUAL_MAP20;
					map->s_partition_func =
							udf_get_pblock_virt20;
				}
 			} else if (!strncmp(upm2->partIdent.ident,
 						UDF_ID_SPARABLE,
 						strlen(UDF_ID_SPARABLE))) {
				if (udf_load_sparable_map(sb, map,
				    (struct sparablePartitionMap *)gpm) < 0)
					goto out_bh;
 			} else if (!strncmp(upm2->partIdent.ident,
 						UDF_ID_METADATA,
 						strlen(UDF_ID_METADATA))) {
				struct udf_meta_data *mdata =
					&map->s_type_specific.s_metadata;
				struct metadataPartitionMap *mdm =
						(struct metadataPartitionMap *)
						&(lvd->partitionMaps[offset]);
				udf_debug("Parsing Logical vol part %d type %d  id=%s\n",
					  i, type, UDF_ID_METADATA);

				map->s_partition_type = UDF_METADATA_MAP25;
				map->s_partition_func = udf_get_pblock_meta25;

				mdata->s_meta_file_loc   =
					le32_to_cpu(mdm->metadataFileLoc);
				mdata->s_mirror_file_loc =
					le32_to_cpu(mdm->metadataMirrorFileLoc);
				mdata->s_bitmap_file_loc =
					le32_to_cpu(mdm->metadataBitmapFileLoc);
				mdata->s_alloc_unit_size =
					le32_to_cpu(mdm->allocUnitSize);
				mdata->s_align_unit_size =
					le16_to_cpu(mdm->alignUnitSize);
				if (mdm->flags & 0x01)
					mdata->s_flags |= MF_DUPLICATE_MD;

				udf_debug("Metadata Ident suffix=0x%x\n",
					  le16_to_cpu(*(__le16 *)
						      mdm->partIdent.identSuffix));
				udf_debug("Metadata part num=%d\n",
					  le16_to_cpu(mdm->partitionNum));
				udf_debug("Metadata part alloc unit size=%d\n",
					  le32_to_cpu(mdm->allocUnitSize));
				udf_debug("Metadata file loc=%d\n",
					  le32_to_cpu(mdm->metadataFileLoc));
				udf_debug("Mirror file loc=%d\n",
					  le32_to_cpu(mdm->metadataMirrorFileLoc));
				udf_debug("Bitmap file loc=%d\n",
					  le32_to_cpu(mdm->metadataBitmapFileLoc));
				udf_debug("Flags: %d %d\n",
					  mdata->s_flags, mdm->flags);
			} else {
				udf_debug("Unknown ident: %s\n",
					  upm2->partIdent.ident);
				continue;
			}
			map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
			map->s_partition_num = le16_to_cpu(upm2->partitionNum);
		}
		udf_debug("Partition (%d:%d) type %d on volume %d\n",
			  i, map->s_partition_num, type, map->s_volumeseqnum);
	}

	if (fileset) {
		struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);

		*fileset = lelb_to_cpu(la->extLocation);
		udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
			  fileset->logicalBlockNum,
			  fileset->partitionReferenceNum);
	}
	if (lvd->integritySeqExt.extLength)
		udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));

out_bh:
	brelse(bh);
	return ret;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.