Texture from PNG - problems

  
GLuint tex;

bool loadPngTex(string fname)
{
  // ... PNG loading stuff

  // which I know is correct ''cause I''ve displayed a PNG in 2D

  // with the same code


  png_byte **imageData = png_get_rows(pngStruct, pngInfo);
  GLubyte* newImage = new GLubyte[imageHeight * imageWidth * bytesPerPixel];
  
  // reverse row order so that the lower left corner is 0,0

	for (int i = imageHeight-1; i >= 0; i--)
	{
    memcpy(&newImage[imageHeight - i - 1], imageData[i], imageWidth * bytesPerPixel);
	}

  glGenTextures(1, &tex);
  glBindTexture(GL_TEXTURE_2D, tex);
  glTexImage2D(GL_TEXTURE_2D, 0, bytesPerPixel, imageWidth, imageHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, newImage);
  glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);	// Linear Filtering

glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);	// Linear Filtering


  delete newImage;
  png_destroy_read_struct(&pngStruct, &pngInfo, NULL);
  return true;
}

What''s wrong with this?