drbd: fix request leak introduced by locking/atomic, kref: Kill kref_sub()

When killing kref_sub(), the unconditional additional kref_get()
was not properly paired with the necessary kref_put(), causing
a leak of struct drbd_requests (~ 224 Bytes) per submitted bio,
and breaking DRBD in general, as the destructor of those "drbd_requests"
does more than just the mempoll_free().

Fixes: bdfafc4ffdd2 ("locking/atomic, kref: Kill kref_sub()")
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Cc: stable@vger.kernel.org # v4.11
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index b5730e1..6566243 100644 (file)
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -315,24 +315,32 @@ void drbd_req_complete(struct drbd_request *req, struct bio_and_error *m)
 }
 
 /* still holds resource->req_lock */
-static int drbd_req_put_completion_ref(struct drbd_request *req, struct bio_and_error *m, int put)
+static void drbd_req_put_completion_ref(struct drbd_request *req, struct bio_and_error *m, int put)
 {
        struct drbd_device *device = req->device;
        D_ASSERT(device, m || (req->rq_state & RQ_POSTPONED));
 
+       if (!put)
+               return;
+
        if (!atomic_sub_and_test(put, &req->completion_ref))
-               return 0;
+               return;
 
        drbd_req_complete(req, m);
 
+       /* local completion may still come in later,
+        * we need to keep the req object around. */
+       if (req->rq_state & RQ_LOCAL_ABORTED)
+               return;
+
        if (req->rq_state & RQ_POSTPONED) {
                /* don't destroy the req object just yet,
                 * but queue it for retry */
                drbd_restart_request(req);
-               return 0;
+               return;
        }
 
-       return 1;
+       kref_put(&req->kref, drbd_req_destroy);
 }
 
 static void set_if_null_req_next(struct drbd_peer_device *peer_device, struct drbd_request *req)
@@ -519,12 +527,8 @@ static void mod_rq_state(struct drbd_request *req, struct bio_and_error *m,
        if (req->i.waiting)
                wake_up(&device->misc_wait);
 
-       if (c_put) {
-               if (drbd_req_put_completion_ref(req, m, c_put))
-                       kref_put(&req->kref, drbd_req_destroy);
-       } else {
-               kref_put(&req->kref, drbd_req_destroy);
-       }
+       drbd_req_put_completion_ref(req, m, c_put);
+       kref_put(&req->kref, drbd_req_destroy);
 }
 
 static void drbd_report_io_error(struct drbd_device *device, struct drbd_request *req)
@@ -1366,8 +1370,7 @@ nodata:
        }
 
 out:
-       if (drbd_req_put_completion_ref(req, &m, 1))
-               kref_put(&req->kref, drbd_req_destroy);
+       drbd_req_put_completion_ref(req, &m, 1);
        spin_unlock_irq(&resource->req_lock);
 
        /* Even though above is a kref_put(), this is safe.