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Subject[PATCH v2 20/22] mm/mremap: Use vma_lookup() in vma_to_resize()
Date
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@Oracle.com>
Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Davidlohr Bueso <dbueso@suse.de>
---
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
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