static s32 brcmf_config_wowl_pattern(struct brcmf_if *ifp, u8 cmd[4],
				     u8 *pattern, u32 patternsize, u8 *mask,
				     u32 packet_offset)
{
	struct brcmf_fil_wowl_pattern_le *filter;
	u32 masksize;
	u32 patternoffset;
	u8 *buf;
	u32 bufsize;
	s32 ret;

	masksize = (patternsize + 7) / 8;
	patternoffset = sizeof(*filter) - sizeof(filter->cmd) + masksize;

	bufsize = sizeof(*filter) + patternsize + masksize;
	buf = kzalloc(bufsize, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	filter = (struct brcmf_fil_wowl_pattern_le *)buf;

	memcpy(filter->cmd, cmd, 4);
	filter->masksize = cpu_to_le32(masksize);
	filter->offset = cpu_to_le32(packet_offset);
	filter->patternoffset = cpu_to_le32(patternoffset);
	filter->patternsize = cpu_to_le32(patternsize);
	filter->type = cpu_to_le32(BRCMF_WOWL_PATTERN_TYPE_BITMAP);

	if ((mask) && (masksize))
		memcpy(buf + sizeof(*filter), mask, masksize);
	if ((pattern) && (patternsize))
		memcpy(buf + sizeof(*filter) + masksize, pattern, patternsize);

	ret = brcmf_fil_iovar_data_set(ifp, "wowl_pattern", buf, bufsize);

	kfree(buf);
	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.