boost_python扩展内存泄露

[幻海轩辕]

下面是在下写python的扩展代码，但是出现了泄露，希望高手指点一二

const char * decodeYUV420RGB(char * buf,  int width, int height)
{
	int R,G,B,Y,U,V;
	int x,y;
	unsigned char *rgb24;
	rgb24 = (unsigned char *)malloc(sizeof(char)*width*height*3);
	unsigned char* tempbuf = (unsigned char*)buf;
	unsigned char *yuv420[3] = {tempbuf,tempbuf+width*height,tempbuf+width*height*5/4};
	int nWidth = width>>1; //色度信号宽度
	for (y=0;y<height;y++)
	{
		for (x=0;x<width;x++)
		{
			Y = *(yuv420[0] + y*width + x);
			U = *(yuv420[1] + ((y>>1)*nWidth) + (x>>1));
			V = *(yuv420[2] + ((y>>1)*nWidth) + (x>>1));
			R = Y + 1.402*(V-128);
			G = Y - 0.34414*(U-128) - 0.71414*(V-128);
			B = Y + 1.772*(U-128);

			//防止越界
			if (R>=255)R=254;
			if (R<=0)R=1;
			if (G>=255)G=254;
			if (G<=0)G=1;
			if (B>=255)B=254;
			if (B<=0)B=1;

			*(rgb24 + ((y)*width + x)*3) = R;
			*(rgb24 + ((y)*width + x)*3 + 1) = G;
			*(rgb24 + ((y)*width + x)*3 + 2) = B;
			//    *(rgb24 + (y*width + x)*3) = B;
			//    *(rgb24 + (y*width + x)*3 + 1) = G;
			//    *(rgb24 + (y*width + x)*3 + 2) = R;  
		}
	}
	return (char*)rgb24;
}
BOOST_PYTHON_MODULE(yuvtorgb)
{
	def("decodeYUV420", decodeYUV420RGB);
}