SslIoRead memory leak in NSOutputStream (iPhone SDK)

Hi, I am using NSOutputStream to write email to smtp server. I used TLSv1 as security protocol. I found that everytime I open such a output stream and output as TLSv1, there is about 36k memory leak from a call "sslIoRead". Perfermance tool aslo link it to something like this in the code:
[outputStream setProperty:NSStreamSocketSecurityLevelTLSv1 forKey:NSStreamSocketSecurityLevelKey]
Anyone as the same experience, how can I fix it?
Thank you very much.

Added code in a more readable fashion:
CGImageRef blockRef = CGImageCreateWithImageInRect([img CGImage], CGRectMake(imgWidth - clipx, clipy,texsize,texsize));
CGContextRef spriteContext = CGBitmapContextCreate(spriteData, tex_size, tex_size, 8, tex_size * 4, CGImageGetColorSpace(blockRef), kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
CGContextDrawImage(spriteContext, CGRectMake(0,0,(CGFloat)tex_size, (CGFloat)tex_size), blockRef);
glGenTextures(1, &texref);
glBindTexture(GLTEXTURE2D, texref);
glTexImage2D(GLTEXTURE2D, 0, GL_RGBA, 512, 512, 0, GL_RGBA, GLUNSIGNEDBYTE, spriteData);
glTexParameterx(GLTEXTURE2D, GLTEXTURE_MINFILTER, GL_LINEAR);
glTexParameterx(GLTEXTURE2D, GLTEXTURE_MAGFILTER, GL_LINEAR);
CGImageRelease(blockRef);
CGContextRelease(spriteContext);

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