ceph: fix inode refcount leak when ceph_fill_inode on non-I_NEW inode fails

stable inclusion
from stable-5.10.5
commit 86be0f2a0ef9d85e4872d4017b09e4e620d948ae
bugzilla: 46931

--------------------------------

[ Upstream commit 68cbb805 ]
Signed-off-by: NJeff Layton <jlayton@kernel.org>
Reviewed-by: NIlya Dryomov <idryomov@gmail.com>
Signed-off-by: NIlya Dryomov <idryomov@gmail.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

fs/ceph/inode.c

@@ -1335,6 +1335,8 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
 				in, ceph_vinop(in));
 			if (in->i_state & I_NEW)
 				discard_new_inode(in);
+			else
+				iput(in);
 			goto done;
 		}
 		req->r_target_inode = in;