Messages in this thread Patch in this message | | | From | Liam Howlett <> | Subject | [PATCH v2 21/22] mm/memory.c: Use vma_lookup() in __access_remote_vm() | Date | Fri, 21 May 2021 17:48:07 +0000 |
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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> Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com> Acked-by: David Hildenbrand <david@redhat.com> Acked-by: Davidlohr Bueso <dbueso@suse.de> --- mm/memory.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
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, -- 2.30.2
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