diff options
Diffstat (limited to 'mm/mincore.c')
| -rw-r--r-- | mm/mincore.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/mm/mincore.c b/mm/mincore.c index 95c5f49f0a1..5efe0ded69b 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)) @@ -116,10 +124,17 @@ static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pag /* migration entries are always uptodate */ present = 1; } else { +#ifdef CONFIG_SWAP pgoff = entry.val; present = mincore_page(&swapper_space, pgoff); +#else + WARN_ON(1); + present = 1; +#endif } } + + vec[i] = present; } pte_unmap_unlock(ptep-1, ptl); @@ -130,6 +145,9 @@ none_mapped: pgoff = linear_page_index(vma, addr); for (i = 0; i < nr; i++, pgoff++) vec[i] = mincore_page(vma->vm_file->f_mapping, pgoff); + } else { + for (i = 0; i < nr; i++) + vec[i] = 0; } return nr; |