diff options
| author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2013-09-11 14:22:16 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-11 15:57:50 -0700 |
| commit | 0bf598d863e3c741d47e3178d645f04c9d6c186c (patch) | |
| tree | 4929a438298150fa92c800ac40c337d36531a70e /mm/mempolicy.c | |
| parent | 98094945785464c657d598291d714d11694c8cd9 (diff) | |
| download | lwn-0bf598d863e3c741d47e3178d645f04c9d6c186c.tar.gz lwn-0bf598d863e3c741d47e3178d645f04c9d6c186c.zip | |
mbind: add BUG_ON(!vma) in new_vma_page()
new_vma_page() is called only by page migration called from do_mbind(),
where pages to be migrated are queued into a pagelist by
queue_pages_range(). queue_pages_range() confirms that a queued page
belongs to some vma, so !vma case is not supposed to be happen. This
patch adds BUG_ON() to catch this unexpected case.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mempolicy.c')
| -rw-r--r-- | mm/mempolicy.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 9d778637b088..04729647f359 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1196,12 +1196,14 @@ static struct page *new_vma_page(struct page *page, unsigned long private, int * break; vma = vma->vm_next; } + /* + * queue_pages_range() confirms that @page belongs to some vma, + * so vma shouldn't be NULL. + */ + BUG_ON(!vma); if (PageHuge(page)) return alloc_huge_page_noerr(vma, address, 1); - /* - * if !vma, alloc_page_vma() will use task or system default policy - */ return alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address); } #else |