static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
{
	struct primaryVolDesc *pvoldesc;
	struct ustr *instr, *outstr;
	struct buffer_head *bh;
	uint16_t ident;
	int ret = 1;

	instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
	if (!instr)
		return 1;

	outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
	if (!outstr)
		goto out1;

	bh = udf_read_tagged(sb, block, block, &ident);
	if (!bh)
		goto out2;

	BUG_ON(ident != TAG_IDENT_PVD);

	pvoldesc = (struct primaryVolDesc *)bh->b_data;

	if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
			      pvoldesc->recordingDateAndTime)) {
#ifdef UDFFS_DEBUG
		struct timestamp *ts = &pvoldesc->recordingDateAndTime;
		udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
			  le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
			  ts->minute, le16_to_cpu(ts->typeAndTimezone));
#endif
	}

	if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
		if (udf_CS0toUTF8(outstr, instr)) {
			strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
				outstr->u_len > 31 ? 31 : outstr->u_len);
			udf_debug("volIdent[] = '%s'\n",
				  UDF_SB(sb)->s_volume_ident);
		}

	if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
		if (udf_CS0toUTF8(outstr, instr))
			udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);

	brelse(bh);
	ret = 0;
out2:
	kfree(outstr);
out1:
	kfree(instr);
	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.