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authorLiam Howlett <liam.howlett@oracle.com>2021-06-28 19:39:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-06-29 10:53:52 -0700
commit3e418f9888463a80d559498a523e582b59e5ff2d (patch)
tree4ec235fcb9ac8198d480965b2d0a9bd1a1e87d6c
parent5aaf07f0812adef788f9f08a73914148b5fdd40e (diff)
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. Link: https://lkml.kernel.org/r/20210521174745.2219620-22-Liam.Howlett@Oracle.com 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> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/memory.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memory.c b/mm/memory.c
index b195ece205ef..3dd6b2e73e1d 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4994,8 +4994,8 @@ 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,