From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Mon, 1 Mar 2021 19:30:38 +0000 (-0500)
Subject: mm/memory.c: Use vma_lookup() in __access_remote_vm()
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=04f30f59a26662b33086ff2ab4699e70c7e97964;p=users%2Fjedix%2Flinux-maple.git

mm/memory.c: Use vma_lookup() in __access_remote_vm()

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>
---

diff --git a/mm/memory.c b/mm/memory.c
index 86ba6c1f6821..e3b56903b111 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4954,8 +4954,8 @@ int __access_remote_vm(struct mm_struct *mm, unsigned long addr, void *buf,
 			 * Check if this is a VM_IO | VM_PFNMAP VMA, which
 			 * we can access using slightly different code.
 			 */
-			vma = find_vma(mm, addr);
-			if (!vma || vma->vm_start > addr)
+			vma = vma_lookup(mm, addr);
+			if (!vma)
 				break;
 			if (vma->vm_ops && vma->vm_ops->access)
 				ret = vma->vm_ops->access(vma, addr, buf,