BGD_DECLARE(gdImagePtr) gdImageCropAuto(gdImagePtr im, const unsigned int mode)
{
	const int width = gdImageSX(im);
	const int height = gdImageSY(im);

	int x,y;
	int color, match;
	gdRect crop;

	crop.x = 0;
	crop.y = 0;
	crop.width = 0;
	crop.height = 0;

	switch (mode) {
	case GD_CROP_TRANSPARENT:
		color = gdImageGetTransparent(im);
		break;

	case GD_CROP_BLACK:
		color = gdImageColorClosestAlpha(im, 0, 0, 0, 0);
		break;

	case GD_CROP_WHITE:
		color = gdImageColorClosestAlpha(im, 255, 255, 255, 0);
		break;

	case GD_CROP_SIDES:
		gdGuessBackgroundColorFromCorners(im, &color);
		break;

	case GD_CROP_DEFAULT:
	default:
		color = gdImageGetTransparent(im);
		break;
	}

	/* TODO: Add gdImageGetRowPtr and works with ptr at the row level
	 * for the true color and palette images
	 * new formats will simply work with ptr
	 */
	match = 1;
	for (y = 0; match && y < height; y++) {
		for (x = 0; match && x < width; x++) {
			match = (color == gdImageGetPixel(im, x,y));
		}
	}

	/* Nothing to do > bye
	 * Duplicate the image?
	 */
	if (y == height - 1) {
		return NULL;
	}

	crop.y = y -1;
	match = 1;
	for (y = height - 1; match && y >= 0; y--) {
		for (x = 0; match && x < width; x++) {
			match = (color == gdImageGetPixel(im, x,y));
		}
	}

	if (y == 0) {
		crop.height = height - crop.y + 1;
	} else {
		crop.height = y - crop.y + 2;
	}

	match = 1;
	for (x = 0; match && x < width; x++) {
		for (y = 0; match && y < crop.y + crop.height - 1; y++) {
			match = (color == gdImageGetPixel(im, x,y));
		}
	}
	crop.x = x - 1;

	match = 1;
	for (x = width - 1; match && x >= 0; x--) {
		for (y = 0; match &&  y < crop.y + crop.height - 1; y++) {
			match = (color == gdImageGetPixel(im, x,y));
		}
	}
	crop.width = x - crop.x + 2;

	return gdImageCrop(im, &crop);
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.