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userfaultfd: use helper function range_in_vma() 

We can use range_in_vma() to check if dst_start, dst_start + len are
within the dst_vma range.  Minor readability improvement.

Link: https://lkml.kernel.org/r/20230417003919.930515-1-zhangpeng362@huawei.com
Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Nanyong Sun <sunnanyong@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
ZhangPeng 2023-04-17 08:39:19 +08:00 committed by Andrew Morton
parent 13215e8a4b
commit 686ea6e61d
1 changed files with 1 additions and 5 deletions
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6
mm/userfaultfd.c
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@ -31,11 +31,7 @@ struct vm_area_struct *find_dst_vma(struct mm_struct *dst_mm,
struct vm_area_struct *dst_vma;
dst_vma = find_vma(dst_mm, dst_start);
if (!dst_vma)
return NULL;
if (dst_start < dst_vma->vm_start ||
dst_start + len > dst_vma->vm_end)
if (!range_in_vma(dst_vma, dst_start, dst_start + len))
return NULL;
/*