ceph: avoid divide by zero in __validate_layout()

If "l->stripe_unit" is zero the the mod on the next line will cause a
divide by zero bug.  This comes from the copy_from_user() in
ceph_ioctl_set_layout_policy().  Passing 0 is valid, though (it means
"do not change") so avoid the % check in that case.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
index 8e3fb69fbe6..1396ceb4679 100644
--- a/fs/ceph/ioctl.c
+++ b/fs/ceph/ioctl.c
@@ -42,7 +42,8 @@ static long __validate_layout(struct ceph_mds_client *mdsc,
         /* validate striping parameters */
         if ((l->object_size & ~PAGE_MASK) ||
             (l->stripe_unit & ~PAGE_MASK) ||
-            ((unsigned)l->object_size % (unsigned)l->stripe_unit))
+            (l->stripe_unit != 0 &&
+             ((unsigned)l->object_size % (unsigned)l->stripe_unit)))
                 return -EINVAL;
 
         /* make sure it's a valid data pool */