From e0a04cffa4e97e1e53625e40e70895c882e8972f Mon Sep 17 00:00:00 2001 From: Nick Piggin Date: Wed, 14 Feb 2007 12:39:01 +0100 Subject: [PATCH] [PATCH] mincore: vma crossing fix My mincore also forgot about crossing vmas. Signed-off-by: Nick Piggin Signed-off-by: Linus Torvalds --- mm/mincore.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/mm/mincore.c b/mm/mincore.c index 9c1d0a426e95..5efe0ded69b1 100644 --- a/mm/mincore.c +++ b/mm/mincore.c @@ -77,8 +77,16 @@ static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pag * PTE array for our address. */ nr = PTRS_PER_PTE - ((addr >> PAGE_SHIFT) & (PTRS_PER_PTE-1)); - if (nr > pages) - nr = pages; + + /* + * Don't overrun this vma + */ + nr = min(nr, (vma->vm_end - addr) >> PAGE_SHIFT); + + /* + * Don't return more than the caller asked for + */ + nr = min(nr, pages); pgd = pgd_offset(vma->vm_mm, addr); if (pgd_none_or_clear_bad(pgd)) -- 2.34.1