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[PATCH] mincore: vma crossing fix

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My mincore also forgot about crossing vmas.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin 2007-02-14 12:39:01 +01:00 committed by Linus Torvalds
parent 4a76ef036a
commit e0a04cffa4
1 changed files with 10 additions and 2 deletions
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12
mm/mincore.c
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@ -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))