static int cx24116_writereg(struct cx24116_state *state, int reg, int data)
{
	u8 buf[] = { reg, data };
	struct i2c_msg msg = { .addr = state->config->demod_address,
		.flags = 0, .buf = buf, .len = 2 };
	int err;

	if (debug > 1)
		printk("cx24116: %s: write reg 0x%02x, value 0x%02x\n",
			__func__, reg, data);

	err = i2c_transfer(state->i2c, &msg, 1);
	if (err != 1) {
		printk(KERN_ERR "%s: writereg error(err == %i, reg == 0x%02x,"
			 " value == 0x%02x)\n", __func__, err, reg, data);
		return -EREMOTEIO;
	}

	return 0;
}

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.