From 5b952b3c143660b6436fcb299b249cefde61c18d Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Tue, 13 Sep 2005 01:25:08 -0700 Subject: [PATCH] [PATCH] Fix MPOL_F_VERIFY There was a pretty bad bug in there that the code would always check the full VMA, not the range the user requested. When the VMA to be checked was merged with the previous VMA this could lead to spurious failures. Signed-off-by: "Andi Kleen" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/mempolicy.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index afa06e184d..9033f0859a 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -333,8 +333,13 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end, if (prev && prev->vm_end < vma->vm_start) return ERR_PTR(-EFAULT); if ((flags & MPOL_MF_STRICT) && !is_vm_hugetlb_page(vma)) { + unsigned long endvma = vma->vm_end; + if (endvma > end) + endvma = end; + if (vma->vm_start > start) + start = vma->vm_start; err = check_pgd_range(vma->vm_mm, - vma->vm_start, vma->vm_end, nodes); + start, endvma, nodes); if (err) { first = ERR_PTR(err); break; -- 2.39.5