static struct radeon_atom_ss *radeon_atombios_get_ss_info(struct
							  radeon_encoder
							  *encoder,
							  int id)
{
	struct drm_device *dev = encoder->base.dev;
	struct radeon_device *rdev = dev->dev_private;
	struct radeon_mode_info *mode_info = &rdev->mode_info;
	int index = GetIndexIntoMasterTable(DATA, PPLL_SS_Info);
	uint16_t data_offset;
	struct _ATOM_SPREAD_SPECTRUM_INFO *ss_info;
	uint8_t frev, crev;
	struct radeon_atom_ss *ss = NULL;
	int i;

	if (id > ATOM_MAX_SS_ENTRY)
		return NULL;

	if (atom_parse_data_header(mode_info->atom_context, index, NULL,
				   &frev, &crev, &data_offset)) {
		ss_info =
			(struct _ATOM_SPREAD_SPECTRUM_INFO *)(mode_info->atom_context->bios + data_offset);

		ss =
		    kzalloc(sizeof(struct radeon_atom_ss), GFP_KERNEL);

		if (!ss)
			return NULL;

		for (i = 0; i < ATOM_MAX_SS_ENTRY; i++) {
			if (ss_info->asSS_Info[i].ucSS_Id == id) {
				ss->percentage =
					le16_to_cpu(ss_info->asSS_Info[i].usSpreadSpectrumPercentage);
				ss->type = ss_info->asSS_Info[i].ucSpreadSpectrumType;
				ss->step = ss_info->asSS_Info[i].ucSS_Step;
				ss->delay = ss_info->asSS_Info[i].ucSS_Delay;
				ss->range = ss_info->asSS_Info[i].ucSS_Range;
				ss->refdiv = ss_info->asSS_Info[i].ucRecommendedRef_Div;
				break;
			}
		}
	}
	return ss;
}

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.