fix the seg problem
fix the seg problem

horryq/tcpcopy,u20024804/tcpcopy,liviusATnetskope/second,wfxiang08/tcpcopy,ycaihua/tcpcopy,daodaoliang/tcpcopy,liviusATnetskope/second,daodaoliang/tcpcopy,left2right/tcpcopy,caosiyang/tcpcopy,sshling/tcpcopy,eliteYang/tcpcopy,horryq/tcpcopy,wfxiang08/tcpcopy,ycaihua/tcpcopy,left2right/tcpcopy,eliteYang/tcpcopy,u20024804/tcpcopy,sshling/tcpcopy,caosiyang/tcpcopy