[patch 124/192] mm/mremap: use vma_lookup() in vma_to_resize()

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From: Liam Howlett <liam.howlett@xxxxxxxxxx>
Subject: mm/mremap: use vma_lookup() in vma_to_resize()

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.

Link: https://lkml.kernel.org/r/20210521174745.2219620-21-Liam.Howlett@xxxxxxxxxx
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>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/mremap.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/mm/mremap.c~mm-mremap-use-vma_lookup-in-vma_to_resize
+++ a/mm/mremap.c
@@ -634,10 +634,11 @@ static struct vm_area_struct *vma_to_res
 	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);
 
 	/*
_




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