BGD_DECLARE(gdImagePtr) gdImageRotateInterpolated(const gdImagePtr src, const float angle, int bgcolor)
{
	/* round to two decimals and keep the 100x multiplication to use it in the common square angles 
	   case later. Keep the two decimal precisions so smaller rotation steps can be done, useful for
	   slow animations, f.e. */
	const int angle_rounded = fmod((int) floorf(angle * 100), 360 * 100);

	if (bgcolor < 0) {
		return NULL;
	}

	/* 0 && 90 degrees multiple rotation, 0 rotation simply clones the return image and convert it
	   to truecolor, as we must return truecolor image. */
	switch (angle_rounded) {
		case    0: {
			gdImagePtr dst = gdImageClone(src);

			if (dst == NULL) {
				return NULL;
			}
			if (dst->trueColor == 0) {
				gdImagePaletteToTrueColor(dst);
			}
			return dst;
		}

		case -27000:
		case   9000:
			return gdImageRotate90(src, 0);

		case -18000:
		case  18000:
			return gdImageRotate180(src, 0);

		case  -9000:
		case  27000:
			return gdImageRotate270(src, 0);
	}

	if (src == NULL || src->interpolation_id < 1 || src->interpolation_id > GD_METHOD_COUNT) {
		return NULL;
	}

	switch (src->interpolation_id) {
		case GD_NEAREST_NEIGHBOUR:
			return gdImageRotateNearestNeighbour(src, angle, bgcolor);
			break;

		case GD_BILINEAR_FIXED:
			return gdImageRotateBilinear(src, angle, bgcolor);
			break;

		case GD_BICUBIC_FIXED:
			return gdImageRotateBicubicFixed(src, angle, bgcolor);
			break;

		default:
			return gdImageRotateGeneric(src, angle, bgcolor);
	}
	return NULL;
}

This vulnerability category highlights issues in resource management where failures to properly release memory, file handles, or other resources can degrade system performance or enable denial-of-service conditions.