rbd: do a safe list traversal in rbd_img_request_submit()

It's possible that the reference to the object request dropped
inside the loop in rbd_img_request_submit() will be the last
one, in which case the content of the object pointer can't be
trusted.

Use a safe form of the object request list traversal to avoid
problems.

This resolves:
    http://tracker.ceph.com/issues/4705

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index f556f8a..b7b7a88 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1742,9 +1742,10 @@ static int rbd_img_request_submit(struct rbd_img_request *img_request)
        struct rbd_device *rbd_dev = img_request->rbd_dev;
        struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
        struct rbd_obj_request *obj_request;
+       struct rbd_obj_request *next_obj_request;
 
        dout("%s: img %p\n", __func__, img_request);
-       for_each_obj_request(img_request, obj_request) {
+       for_each_obj_request_safe(img_request, obj_request, next_obj_request) {
                int ret;
 
                obj_request->callback = rbd_img_obj_callback;