[PATCH 21/22] mm/memory.c: Use vma_lookup() in __access_remote_vm()

Liam Howlett
2021-05-10T17:00:11Z

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/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