mm/hmm: hmm_pfns_bad() was accessing wrong struct

commit c719547f032d4610c7a20900baacae26d0b1ff3e upstream.

The private field of mm_walk struct point to an hmm_vma_walk struct and
not to the hmm_range struct desired.  Fix to get proper struct pointer.

Link: http://lkml.kernel.org/r/20180323005527.758-6-jglisse@redhat.com
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Cc: Evgeny Baskakov <ebaskakov@nvidia.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Mark Hairgrove <mhairgrove@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/mm/hmm.c b/mm/hmm.c
index a88a847bccba700a1c0f51d0a819dcf365995ed1..81ff1dbbf8a808c8da35aa48dde78f4a742e61d2 100644 (file)
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -277,7 +277,8 @@ static int hmm_pfns_bad(unsigned long addr,
                        unsigned long end,
                        struct mm_walk *walk)
 {
-       struct hmm_range *range = walk->private;
+       struct hmm_vma_walk *hmm_vma_walk = walk->private;
+       struct hmm_range *range = hmm_vma_walk->range;
        hmm_pfn_t *pfns = range->pfns;
        unsigned long i;