libceph: make sure redirect does not change namespace

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index b68cc15..b5ec096 100644 (file)
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -2608,10 +2608,23 @@ static int ceph_oloc_decode(void **p, void *end,
        }
 
        if (struct_v >= 5) {
+               bool changed = false;
+
                len = ceph_decode_32(p);
                if (len > 0) {
                        ceph_decode_need(p, end, len, e_inval);
+                       if (!oloc->pool_ns ||
+                           ceph_compare_string(oloc->pool_ns, *p, len))
+                               changed = true;
                        *p += len;
+               } else {
+                       if (oloc->pool_ns)
+                               changed = true;
+               }
+               if (changed) {
+                       /* redirect changes namespace */
+                       pr_warn("ceph_object_locator::nspace is changed\n");
+                       goto e_inval;
                }
        }
 
@@ -2820,7 +2833,9 @@ static void handle_reply(struct ceph_osd *osd, struct ceph_msg *msg)
                goto out_unlock_session;
        }
 
+       m.redirect.oloc.pool_ns = req->r_t.target_oloc.pool_ns;
        ret = decode_MOSDOpReply(msg, &m);
+       m.redirect.oloc.pool_ns = NULL;
        if (ret) {
                pr_err("failed to decode MOSDOpReply for tid %llu: %d\n",
                       req->r_tid, ret);