cls_rbd: make sure stripe_unit is not larger than object size

Test a few other cases too.

backport: cuttlefish, bobtail
Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
(cherry picked from commit 810306a2a76eec1c232fd28ec9c351e827fa3031)

2 files changed, 12 insertions, 2 deletions

diff --git a/src/cls/rbd/cls_rbd.cc b/src/cls/rbd/cls_rbd.cc
index ad3402e17ba..2122ac1fd4d 100644
--- a/src/cls/rbd/cls_rbd.cc
+++ b/src/cls/rbd/cls_rbd.cc
@@ -675,8 +675,9 @@ int set_stripe_unit_count(cls_method_context_t hctx, bufferlist *in, bufferlist
     CLS_ERR("failed to read the order off of disk: %s", strerror(r));
     return r;
   }
-  if ((1ull << order) % stripe_unit) {
-    CLS_ERR("stripe unit %lld is not a factor of the object size %lld", stripe_unit, 1ull << order);
+  if ((1ull << order) % stripe_unit || stripe_unit > (1ull << order)) {
+    CLS_ERR("stripe unit %llu is not a factor of the object size %llu",
+            (unsigned long long)stripe_unit, 1ull << order);
     return -EINVAL;
   }
 
diff --git a/src/test/cls_rbd/test_cls_rbd.cc b/src/test/cls_rbd/test_cls_rbd.cc
index 6308980f55f..c147b43f4cb 100644
--- a/src/test/cls_rbd/test_cls_rbd.cc
+++ b/src/test/cls_rbd/test_cls_rbd.cc
@@ -906,6 +906,15 @@ TEST(cls_rbd, stripingv2)
   ASSERT_EQ(8192ull, su);
   ASSERT_EQ(456ull, sc);
 
+  // su must not be larger than an object
+  ASSERT_EQ(-EINVAL, set_stripe_unit_count(&ioctx, "bar", 1 << 23, 1));
+  // su must be a factor of object size
+  ASSERT_EQ(-EINVAL, set_stripe_unit_count(&ioctx, "bar", 511, 1));
+  // su and sc must be non-zero
+  ASSERT_EQ(-EINVAL, set_stripe_unit_count(&ioctx, "bar", 0, 1));
+  ASSERT_EQ(-EINVAL, set_stripe_unit_count(&ioctx, "bar", 1, 0));
+  ASSERT_EQ(-EINVAL, set_stripe_unit_count(&ioctx, "bar", 0, 0));
+
   ioctx.close();
   ASSERT_EQ(0, destroy_one_pool_pp(pool_name, rados));
 }