CVE request: kernel: possible kernel oops from user MSS

[Eugene Teo <eugene () redhat com>]

With commit f5fff5dc8a7a3f395b0525c02ba92c95d42b7390, a user program
can pass in TCP_MAXSEG of 12 (or TCPOLEN_TSTAMP_ALIGNED), and cause
kernel oops with division by 0 in tcp_select_initial_window.

Proposed patch:
http://www.spinics.net/lists/netdev/msg146495.html

Reference:
http://www.spinics.net/lists/netdev/msg146405.html

Thanks, Eugene
--
main(i) { putchar(182623909 >> (i-1) * 5&31|!!(i<7)<<6) && main(++i); }