Commit 46e6b31d authored by Liam Howlett's avatar Liam Howlett Committed by Linus Torvalds
Browse files

lib/test_hmm: use vma_lookup() in dmirror_migrate() 

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/20210521174745.2219620-18-Liam.Howlett@Oracle.com


Signed-off-by: default avatarLiam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: default avatarLaurent Dufour <ldufour@linux.ibm.com>
Acked-by: default avatarDavid Hildenbrand <david@redhat.com>
Acked-by: default avatarDavidlohr Bueso <dbueso@suse.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9016dded

lib/test_hmm.c

+2 −3
Original line number Diff line number Diff line
@@ -686,9 +686,8 @@ static int dmirror_migrate(struct dmirror *dmirror, 


	mmap_read_lock(mm);

	for (addr = start; addr < end; addr = next) {

		vma = find_vma(mm, addr);

		if (!vma || addr < vma->vm_start ||

		    !(vma->vm_flags & VM_READ)) {

		vma = vma_lookup(mm, addr);

		if (!vma || !(vma->vm_flags & VM_READ)) {

			ret = -EINVAL;

			goto out;

		}