Merge tag 'ceph-for-5.0-rc4' of git://github.com/ceph/ceph-client

Pull ceph fixes from Ilya Dryomov:
 "A fix for a potential use-after-free, a patch to close a (mostly
  benign) race in the messenger and a licence clarification for quota.c"

* tag 'ceph-for-5.0-rc4' of git://github.com/ceph/ceph-client:
  ceph: quota: cleanup license mess
  libceph: avoid KEEPALIVE_PENDING races in ceph_con_keepalive()
  ceph: clear inode pointer when snap realm gets dropped by its inode

fs/ceph/caps.c

@@ -1035,6 +1035,8 @@ static void drop_inode_snap_realm(struct ceph_inode_info *ci)
 	list_del_init(&ci->i_snap_realm_item);
 	ci->i_snap_realm_counter++;
 	ci->i_snap_realm = NULL;
+	if (realm->ino == ci->i_vino.ino)
+		realm->inode = NULL;
 	spin_unlock(&realm->inodes_with_caps_lock);
 	ceph_put_snap_realm(ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc,
 			    realm);

fs/ceph/quota.c

@@ -3,19 +3,6 @@
  * quota.c - CephFS quota
  *
  * Copyright (C) 2017-2018 SUSE
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <linux/statfs.h>

net/ceph/messenger.c

@@ -3206,9 +3206,10 @@ void ceph_con_keepalive(struct ceph_connection *con)
 	dout("con_keepalive %p\n", con);
 	mutex_lock(&con->mutex);
 	clear_standby(con);
+	con_flag_set(con, CON_FLAG_KEEPALIVE_PENDING);
 	mutex_unlock(&con->mutex);
-	if (con_flag_test_and_set(con, CON_FLAG_KEEPALIVE_PENDING) == 0 &&
-	    con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0)
+
+	if (con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0)
 		queue_con(con);
 }
 EXPORT_SYMBOL(ceph_con_keepalive);