kclient: fix possible null pointer deref

diff --git a/src/kernel/mds_client.c b/src/kernel/mds_client.c
index 4d994ebf9fa259a9c7dabeee1c1fe5d22839c8f1..5e3efe934179b9aa1dfdafd31bcc986f7e2599d9 100644 (file)
--- a/src/kernel/mds_client.c
+++ b/src/kernel/mds_client.c
@@ -2110,7 +2110,8 @@ void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
 {
        dout(10, "stop\n");
        cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
-       ceph_mdsmap_destroy(mdsc->mdsmap);
+       if (mdsc->mdsmap)
+               ceph_mdsmap_destroy(mdsc->mdsmap);
        kfree(mdsc->sessions);
 }