static uint16_t *plist_utf8_to_utf16(char *unistr, long size, long *items_read, long *items_written)
{
	uint16_t *outbuf = (uint16_t*)malloc(((size*2)+1)*sizeof(uint16_t));
	int p = 0;
	long i = 0;

	unsigned char c0;
	unsigned char c1;
	unsigned char c2;
	unsigned char c3;

	uint32_t w;

	while (i < size) {
		c0 = unistr[i];
		c1 = (i < size-1) ? unistr[i+1] : 0;
		c2 = (i < size-2) ? unistr[i+2] : 0;
		c3 = (i < size-3) ? unistr[i+3] : 0;
		if ((c0 >= 0xF0) && (i < size-3) && (c1 >= 0x80) && (c2 >= 0x80) && (c3 >= 0x80)) {
			w = ((((c0 & 7) << 18) + ((c1 & 0x3F) << 12) + ((c2 & 0x3F) << 6) + (c3 & 0x3F)) & 0x1FFFFF) - 0x010000;
			outbuf[p++] = 0xD800 + (w >> 10);
			outbuf[p++] = 0xDC00 + (w & 0x3FF);
			i+=4;
		} else if ((c0 >= 0xE0) && (i < size-2) && (c1 >= 0x80) && (c2 >= 0x80)) {
			outbuf[p++] = ((c2 & 0x3F) + ((c1 & 3) << 6)) + (((c1 >> 2) & 15) << 8) + ((c0 & 15) << 12);
			i+=3;
		} else if ((c0 >= 0xC0) && (i < size-1) && (c1 >= 0x80)) {
			outbuf[p++] = ((c1 & 0x3F) + ((c0 & 3) << 6)) + (((c0 >> 2) & 7) << 8);
			i+=2;
		} else if (c0 < 0x80) {
			outbuf[p++] = c0;
			i+=1;
		} else {
			PLIST_BIN_ERR("%s: invalid utf8 sequence in string at index %lu\n", __func__, i);
			break;
		}
	}
	if (items_read) {
		*items_read = i;
	}
	if (items_written) {
		*items_written = p;
	}
	outbuf[p] = 0;

	return outbuf;

}

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.