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authorZi Yan <zi.yan@cs.rutgers.edu>2017-11-02 15:59:47 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-03 07:39:19 -0700
commitdd8a67f9a37c74b61e5e050924ceec9ffb4f8c3c (patch)
tree047993d332418b884aa60f0acf08932842d47701 /mm/compaction.c
parente08b1877452a0055c65f6394163ce5a0fbd720a3 (diff)
downloadlinux-dd8a67f9a37c74b61e5e050924ceec9ffb4f8c3c.tar.bz2
mm/huge_memory.c: deposit page table when copying a PMD migration entry
We need to deposit pre-allocated PTE page table when a PMD migration entry is copied in copy_huge_pmd(). Otherwise, we will leak the pre-allocated page and cause a NULL pointer dereference later in zap_huge_pmd(). The missing counters during PMD migration entry copy process are added as well. The bug report is here: https://lkml.org/lkml/2017/10/29/214 Link: http://lkml.kernel.org/r/20171030144636.4836-1-zi.yan@sent.com Fixes: 84c3fc4e9c563 ("mm: thp: check pmd migration entry in common path") Signed-off-by: Zi Yan <zi.yan@cs.rutgers.edu> Reported-by: Fengguang Wu <fengguang.wu@intel.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/compaction.c')
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