static void tg3_rx_data_free(struct tg3 *tp, struct ring_info *ri, u32 map_sz)
{
	unsigned int skb_size = SKB_DATA_ALIGN(map_sz + TG3_RX_OFFSET(tp)) +
		   SKB_DATA_ALIGN(sizeof(struct skb_shared_info));

	if (!ri->data)
		return;

	pci_unmap_single(tp->pdev, dma_unmap_addr(ri, mapping),
			 map_sz, PCI_DMA_FROMDEVICE);
	tg3_frag_free(skb_size <= PAGE_SIZE, ri->data);
	ri->data = NULL;
}

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.