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| author | Nick Piggin <npiggin@suse.de> | 2007-02-14 12:39:01 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-15 09:57:03 -0800 |
| commit | e0a04cffa4e97e1e53625e40e70895c882e8972f (patch) | |
| tree | f76ca38a59f07929ecfbc1caf6609eea67a8854c /mm/mincore.c | |
| parent | 4a76ef036ac415c28d1adbaf2b7a74040b84d4c2 (diff) | |
| download | lwn-e0a04cffa4e97e1e53625e40e70895c882e8972f.tar.gz lwn-e0a04cffa4e97e1e53625e40e70895c882e8972f.zip | |
[PATCH] mincore: vma crossing fix
My mincore also forgot about crossing vmas.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mincore.c')
| -rw-r--r-- | mm/mincore.c | 12 |
1 files 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)) |