From c7546f8f03f5a4fa612605b6be930234d6026860 Mon Sep 17 00:00:00 2001 From: David Gibson Date: Fri, 5 Aug 2005 11:59:35 -0700 Subject: [PATCH] [PATCH] Fix hugepage crash on failing mmap() This patch fixes a crash in the hugepage code. unmap_hugepage_area() was assuming that (due to prefault) PTEs must exist for all the area in question. However, this may not be the case, if mmap() encounters an error before the prefault and calls unmap_region() to clean up any partial mapping. Depending on the hugepage configuration, this crash can be triggered by an unpriveleged user. Signed-off-by: David Gibson Cc: William Lee Irwin III Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/hugetlb.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index fbd1111ea11..6bf720bc662 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -301,6 +301,7 @@ void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, { struct mm_struct *mm = vma->vm_mm; unsigned long address; + pte_t *ptep; pte_t pte; struct page *page; @@ -309,9 +310,17 @@ void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, BUG_ON(end & ~HPAGE_MASK); for (address = start; address < end; address += HPAGE_SIZE) { - pte = huge_ptep_get_and_clear(mm, address, huge_pte_offset(mm, address)); + ptep = huge_pte_offset(mm, address); + if (! ptep) + /* This can happen on truncate, or if an + * mmap() is aborted due to an error before + * the prefault */ + continue; + + pte = huge_ptep_get_and_clear(mm, address, ptep); if (pte_none(pte)) continue; + page = pte_page(pte); put_page(page); } -- 2.20.1