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From:   Liam Howlett <liam.howlett@oracle.com>
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Subject: [PATCH 20/22] mm/mremap: Use vma_lookup() in vma_to_resize()
Thread-Topic: [PATCH 20/22] mm/mremap: Use vma_lookup() in vma_to_resize()
Thread-Index: AQHXRb3EvCCiex4CdkS+XkdMnKxOcg==
Date:   Mon, 10 May 2021 16:58:58 +0000
Message-ID: <20210510165839.2692974-21-Liam.Howlett@Oracle.com>
References: <20210510165839.2692974-1-Liam.Howlett@Oracle.com>
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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>
---
 mm/mremap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/mremap.c b/mm/mremap.c
index 47c255b60150..04143755cd1e 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -634,10 +634,10 @@ static struct vm_area_struct *vma_to_resize(unsigned =
long addr,
 	unsigned long *p)
 {
 	struct mm_struct *mm =3D current->mm;
-	struct vm_area_struct *vma =3D find_vma(mm, addr);
+	struct vm_area_struct *vma =3D vma_lookup(mm, addr);
 	unsigned long pgoff;
=20
-	if (!vma || vma->vm_start > addr)
+	if (!vma)
 		return ERR_PTR(-EFAULT);
=20
 	/*
--=20
2.30.2