CVE request: kernel: oom: fix integer overflow of points in oom_badness

[Eugene Teo <eugene () redhat com>]

An integer overflow will happen on 64bit archs if task's sum of rss,
swapents and nr_ptes exceeds (2^31)/1000 value. This was introduced by
commit f755a04 oom: use pte pages in OOM score. This can cause a denial
of service.

https://lkml.org/lkml/2011/10/31/138

Eugene
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Eugene Teo / Red Hat Security Response Team