Urgent help regarding the buffer overflow

> Hello,
>       There is a buffer overflow vulnerability reported(buffer length
> computation bug) in libresolv(in getanswer routine
         which is solved recently.   
>       Can you please explain 
> * Where actually the buffer length is not updated consistently.
> * Why are we introducing another pointer instead of updating the buffer
> length consistently?
>       Please mail me immediately. Itz very urgent.
> 
> Thanks,
> Vani.