s390/cio: Fix how vfio-ccw checks pinned pages

commit 24abf2901b18bf941b9f21ea2ce5791f61097ae4 upstream.

We have two nested loops to check the entries within the pfn_array_table
arrays.  But we mistakenly use the outer array as an index in our check,
and completely ignore the indexing performed by the inner loop.

Cc: stable@vger.kernel.org
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Message-Id: <20181002010235.42483-1-farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c
index 72ce6ad95767b4d062c65d12eb308f277bbaa0e7..1419eaea03d845b72bca90a01927f9cc6859c63f 100644 (file)
--- a/drivers/s390/cio/vfio_ccw_cp.c
+++ b/drivers/s390/cio/vfio_ccw_cp.c
@@ -172,7 +172,7 @@ static bool pfn_array_table_iova_pinned(struct pfn_array_table *pat,
 
        for (i = 0; i < pat->pat_nr; i++, pa++)
                for (j = 0; j < pa->pa_nr; j++)
-                       if (pa->pa_iova_pfn[i] == iova_pfn)
+                       if (pa->pa_iova_pfn[j] == iova_pfn)
                                return true;
 
        return false;