Description: missing check during hugepage migration
References: 
Notes:
 bwh> Hugepage migration was extended in 3.12 and it's not clear that
 bwh> there is a security impact for older versions.  The upstream commit
 bwh> indicates that is the earliest stable branch it should be backported
 bwh> to.  But it should be harmless to add the pte_present() check to
 bwh> older versions anyway.
Bugs:
upstream: released (3.15-rc8) [d4c54919ed86302094c0ca7d48a8cbd4ee753e92]
2.6.32-upstream-stable: N/A "Only needed for 3.12 and later"
sid: released (3.14.7-1)
3.2-wheezy-security: released (3.2.60-1) [bugfix/all/mm-add-pte_present-check-on-existing-hugetlb_entry-c.patch]
2.6.32-squeeze-security: N/A "Only needed for 3.12 and later"
3.2-upstream-stable: N/A "Only needed for 3.12 and later"