static MagickBooleanType InsertRow(unsigned char *p,ssize_t y,Image *image,
  int bpp)
{
  ExceptionInfo
    *exception;

  int
    bit;

  ssize_t
    x;

  register PixelPacket
    *q;

  IndexPacket
    index;

  register IndexPacket
    *indexes;

  exception=(&image->exception);
  q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
  if (q == (PixelPacket *) NULL)
    return(MagickFalse);
  indexes=GetAuthenticIndexQueue(image);
  switch (bpp)
    {
    case 1:  /* Convert bitmap scanline. */
      {
        for (x=0; x < ((ssize_t) image->columns-7); x+=8)
          {
            for (bit=0; bit < 8; bit++)
              {
                index=((*p) & (0x80 >> bit) ? 0x01 : 0x00);
                SetPixelIndex(indexes+x+bit,index);
                SetPixelRGBO(q,image->colormap+(ssize_t) index);
                q++;
              }
            p++;
          }
        if ((image->columns % 8) != 0)
          {
            for (bit=0; bit < (ssize_t) (image->columns % 8); bit++)
              {
                index=((*p) & (0x80 >> bit) ? 0x01 : 0x00);
                SetPixelIndex(indexes+x+bit,index);
                SetPixelRGBO(q,image->colormap+(ssize_t) index);
                q++;
              }
            p++;
          }
        break;
      }
    case 2:  /* Convert PseudoColor scanline. */
      {
        if ((image->storage_class != PseudoClass) ||
            (indexes == (IndexPacket *) NULL))
          break;
        for (x=0; x < ((ssize_t) image->columns-3); x+=4)
        {
            index=ConstrainColormapIndex(image,(*p >> 6) & 0x3);
            SetPixelIndex(indexes+x,index);
            SetPixelRGBO(q,image->colormap+(ssize_t) index);
            q++;
            index=ConstrainColormapIndex(image,(*p >> 4) & 0x3);
            SetPixelIndex(indexes+x,index);
            SetPixelRGBO(q,image->colormap+(ssize_t) index);
            q++;
            index=ConstrainColormapIndex(image,(*p >> 2) & 0x3);
            SetPixelIndex(indexes+x,index);
            SetPixelRGBO(q,image->colormap+(ssize_t) index);
            q++;
            index=ConstrainColormapIndex(image,(*p) & 0x3);
            SetPixelIndex(indexes+x+1,index);
            SetPixelRGBO(q,image->colormap+(ssize_t) index);
            q++;
            p++;
        }
       if ((image->columns % 4) != 0)
          {
            index=ConstrainColormapIndex(image,(*p >> 6) & 0x3);
            SetPixelIndex(indexes+x,index);
            SetPixelRGBO(q,image->colormap+(ssize_t) index);
            q++;
            if ((image->columns % 4) > 1)
              {
                index=ConstrainColormapIndex(image,(*p >> 4) & 0x3);
                SetPixelIndex(indexes+x,index);
                SetPixelRGBO(q,image->colormap+(ssize_t) index);
                q++;
                if ((image->columns % 4) > 2)
                  {
                    index=ConstrainColormapIndex(image,(*p >> 2) & 0x3);
                    SetPixelIndex(indexes+x,index);
                    SetPixelRGBO(q,image->colormap+(ssize_t) index);
                    q++;
                  }
              }
            p++;
          }
        break;
      }

    case 4:  /* Convert PseudoColor scanline. */
      {
        for (x=0; x < ((ssize_t) image->columns-1); x+=2)
          {
            index=ConstrainColormapIndex(image,(*p >> 4) & 0x0f);
            SetPixelIndex(indexes+x,index);
            SetPixelRGBO(q,image->colormap+(ssize_t) index);
            q++;
            index=ConstrainColormapIndex(image,(*p) & 0x0f);
            SetPixelIndex(indexes+x+1,index);
            SetPixelRGBO(q,image->colormap+(ssize_t) index);
            p++;
            q++;
          }
        if ((image->columns % 2) != 0)
          {
            index=ConstrainColormapIndex(image,(*p >> 4) & 0x0f);
            SetPixelIndex(indexes+x,index);
            SetPixelRGBO(q,image->colormap+(ssize_t) index);
            p++;
            q++;
          }
        break;
      }
    case 8: /* Convert PseudoColor scanline. */
      {
        for (x=0; x < (ssize_t) image->columns; x++)
          {
            index=ConstrainColormapIndex(image,*p);
            SetPixelIndex(indexes+x,index);
            SetPixelRGBO(q,image->colormap+(ssize_t) index);
            p++;
            q++;
          }
      }
      break;

    case 24:     /*  Convert DirectColor scanline.  */
      for (x=0; x < (ssize_t) image->columns; x++)
        {
          SetPixelRed(q,ScaleCharToQuantum(*p++));
          SetPixelGreen(q,ScaleCharToQuantum(*p++));
          SetPixelBlue(q,ScaleCharToQuantum(*p++));
          q++;
        }
      break;
    }
  if (!SyncAuthenticPixels(image,exception))
    return(MagickFalse);
  return(MagickTrue);
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.