Description:
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I find a hidden danger of death cycle in a function of gd：gdImageRotate in the file gd_rotate.c. Although from the version 5.5.0 the function is changed to another function:gdImageRotateInterpolated(not for the reason I proposed)，but the original is not deleted.So,I think it is a hidden danger of death cycle.
while (dAngle >= 360.0) {
		dAngle -= 360.0;
	}
dAngle is a double.When it is assigned a large floating point number e.g:1e20,the function goes to a death cycle because 1e20-360.0=1e20！
The following script only goes wrong in the version before 5.5.0.But I still think it is a hidden danger since the function gd：gdImageRotate is not deleted.

Test script:
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<?php
 // File and rotation
 $filename = 'dog.jpg';
 $angle = 2e30;
 $im = imagecreatefromjpeg($filename);
 // Content type
 header('Content-type: image/jpeg');
 
 // Load
 $source = imagecreatefromjpeg($filename);
 
 // Rotate
 $rotate = imagerotate($source, $angle, 0);
 
 // Output
 imagejpeg($rotate,'dogrotate.jpg');
 imagejpeg($source);

 ?>

Expected result:
----------------
Rotate the image with right angle.

Actual result:
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death cycle