[PATCH v2 20/22] mm/mremap: Use vma_lookup() in vma_to_resize()

[Liam Howlett]

Use vma_lookup() to find the VMA at a specific address.  As vma_lookup()
will return NULL if the address is not within any VMA, the start address
no longer needs to be validated.

Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Reviewed-by: Laurent Dufour <ldufour@xxxxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Acked-by: Davidlohr Bueso <dbueso@xxxxxxx>
---
 mm/mremap.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/mremap.c b/mm/mremap.c
index 47c255b60150..a369a6100698 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -634,10 +634,11 @@ static struct vm_area_struct *vma_to_resize(unsigned long addr,
 	unsigned long *p)
 {
 	struct mm_struct *mm = current->mm;
-	struct vm_area_struct *vma = find_vma(mm, addr);
+	struct vm_area_struct *vma;
 	unsigned long pgoff;
 
-	if (!vma || vma->vm_start > addr)
+	vma = vma_lookup(mm, addr);
+	if (!vma)
 		return ERR_PTR(-EFAULT);
 
 	/*
-- 
2.30.2