Description of problem:
Essentially, when kernel receives broken UDP packet(s), select() function must 
not return.
But, select() returns in any RHEL4 (RHEL4U0 - RHEL4U4).

We made udp_poll() backport patch for not returning even if kernel receives 
broken UDP packet.
This patch is for kernel-2.6.9-42.0.3.EL (and kernel-2.6.9-42.EL).

It was no problem for us though had verified with our business system.

Please take it by the following update! (=> RHEL4U5)


Version-Release number of selected component (if applicable):
RHEL4U4: kernel-2.6.9-42.0.3.EL (and kernel-2.6.9-42.EL)


How reproducible:
When select() observes incoming UDP packet by server, clinent sends broken UDP 
packet.
Then, select() returns normally by positive value.

Therefore, recvfrom() (= the functions that acquire packet) freezes until 
kernel receives next normal packet.


Actual results:
select() returns normally when receives broken UDP packet(s)


Expected results:
select() doesn't return when receives broken UDP packet(s)


Additional info:
- It was in the broken IP telephone terminal that sent a broken packet. 
- man 2 select
- http://www.kernel.org/git/?p=linux/kernel/git/torvalds/old-2.6-
bkcvs.git;a=summary (but git is down now)