On Mon, Oct 30, 2017 at 10:46:36AM -0400, Zi Yan wrote: > From: Zi Yan <zi.yan@xxxxxxxxxxxxxx> > > 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 > > Fixes: 84c3fc4e9c563 ("mm: thp: check pmd migration entry in common path") > Reported-by: Fengguang Wu <fengguang.wu@xxxxxxxxx> > Signed-off-by: Zi Yan <zi.yan@xxxxxxxxxxxxxx> > Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> -- Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
