static int cx24116_writeregN(struct cx24116_state *state, int reg,
			     const u8 *data, u16 len)
{
	int ret = -EREMOTEIO;
	struct i2c_msg msg;
	u8 *buf;

	buf = kmalloc(len + 1, GFP_KERNEL);
	if (buf == NULL) {
		printk("Unable to kmalloc\n");
		ret = -ENOMEM;
		goto error;
	}

	*(buf) = reg;
	memcpy(buf + 1, data, len);

	msg.addr = state->config->demod_address;
	msg.flags = 0;
	msg.buf = buf;
	msg.len = len + 1;

	if (debug > 1)
		printk(KERN_INFO "cx24116: %s:  write regN 0x%02x, len = %d\n",
			__func__, reg, len);

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

error:
	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.