From 2b37c35e6552b0d04d5db9728bc7af22d53f731a Mon Sep 17 00:00:00 2001 From: Becky Bruce Date: Mon, 25 Jul 2011 17:11:49 -0700 Subject: [PATCH] fs/hugetlbfs/inode.c: fix pgoff alignment checking on 32-bit This: vma->vm_pgoff & ~(huge_page_mask(h) >> PAGE_SHIFT) is incorrect on 32-bit. It causes us to & the pgoff with something that looks like this (for a 4m hugepage): 0xfff003ff. The mask should be flipped and *then* shifted, to give you 0x0000_03fff. Signed-off-by: Becky Bruce Cc: Benjamin Herrenschmidt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/hugetlbfs/inode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 7aafeb8fa300..537a2093c0e1 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -94,7 +94,7 @@ static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) vma->vm_flags |= VM_HUGETLB | VM_RESERVED; vma->vm_ops = &hugetlb_vm_ops; - if (vma->vm_pgoff & ~(huge_page_mask(h) >> PAGE_SHIFT)) + if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) return -EINVAL; vma_len = (loff_t)(vma->vm_end - vma->vm_start); -- 2.20.1