[kbuild-all] Re: [kbuild] [mptcp:export 5/10] net/mptcp/subflow.c:512 subflow_syn_recv_sock() error: uninitialized symbol 'subflow_req'.

tree: https://github.com/multipath-tcp/mptcp_net-next.git export head: e28f6a7575a0006d0d49de297e23dd915c59ba39 commit: 962c918a1ca2553fac7db45c2a2f9b84fa30a6d9 [5/10] mptcp: refactor token container. config: x86_64-randconfig-m001-20200605 (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; smatch warnings: net/mptcp/subflow.c:512 subflow_syn_recv_sock() error: uninitialized symbol 'subflow_req'. # https://github.com/multipath-tcp/mptcp_net-next/commit/962c918a1ca2553fac... git remote add mptcp https://github.com/multipath-tcp/mptcp_net-next.git git remote update mptcp git checkout 962c918a1ca2553fac7db45c2a2f9b84fa30a6d9 vim +/subflow_req +512 net/mptcp/subflow.c cec37a6e41aae7 Peter Krystad 2020-01-21 430 static struct sock *subflow_syn_recv_sock(const struct sock *sk, cec37a6e41aae7 Peter Krystad 2020-01-21 431 struct sk_buff *skb, cec37a6e41aae7 Peter Krystad 2020-01-21 432 struct request_sock *req, cec37a6e41aae7 Peter Krystad 2020-01-21 433 struct dst_entry *dst, cec37a6e41aae7 Peter Krystad 2020-01-21 434 struct request_sock *req_unhash, cec37a6e41aae7 Peter Krystad 2020-01-21 435 bool *own_req) cec37a6e41aae7 Peter Krystad 2020-01-21 436 { cec37a6e41aae7 Peter Krystad 2020-01-21 437 struct mptcp_subflow_context *listener = mptcp_subflow_ctx(sk); cc7972ea193233 Christoph Paasch 2020-01-21 438 struct mptcp_subflow_request_sock *subflow_req; ^^^^^^^^^^^ cfde141ea3faa3 Paolo Abeni 2020-04-30 439 struct mptcp_options_received mp_opt; f296234c98a8fc Peter Krystad 2020-03-27 440 bool fallback_is_fatal = false; 58b09919626bf9 Paolo Abeni 2020-03-13 441 struct sock *new_msk = NULL; 4c8941de781cf7 Paolo Abeni 2020-04-20 442 bool fallback = false; cec37a6e41aae7 Peter Krystad 2020-01-21 443 struct sock *child; cec37a6e41aae7 Peter Krystad 2020-01-21 444 cec37a6e41aae7 Peter Krystad 2020-01-21 445 pr_debug("listener=%p, req=%p, conn=%p", listener, req, listener->conn); cec37a6e41aae7 Peter Krystad 2020-01-21 446 cfde141ea3faa3 Paolo Abeni 2020-04-30 447 /* we need later a valid 'mp_capable' value even when options are not cfde141ea3faa3 Paolo Abeni 2020-04-30 448 * parsed cfde141ea3faa3 Paolo Abeni 2020-04-30 449 */ cfde141ea3faa3 Paolo Abeni 2020-04-30 450 mp_opt.mp_capable = 0; ae2dd7164943e0 Florian Westphal 2020-01-29 451 if (tcp_rsk(req)->is_mptcp == 0) ae2dd7164943e0 Florian Westphal 2020-01-29 452 goto create_child; ^^^^^^^^^^^^^^^^^ ae2dd7164943e0 Florian Westphal 2020-01-29 453 d22f4988ffecbe Christoph Paasch 2020-01-21 454 /* if the sk is MP_CAPABLE, we try to fetch the client key */ cc7972ea193233 Christoph Paasch 2020-01-21 455 subflow_req = mptcp_subflow_rsk(req); cc7972ea193233 Christoph Paasch 2020-01-21 456 if (subflow_req->mp_capable) { d22f4988ffecbe Christoph Paasch 2020-01-21 457 if (TCP_SKB_CB(skb)->seq != subflow_req->ssn_offset + 1) { d22f4988ffecbe Christoph Paasch 2020-01-21 458 /* here we can receive and accept an in-window, d22f4988ffecbe Christoph Paasch 2020-01-21 459 * out-of-order pkt, which will not carry the MP_CAPABLE d22f4988ffecbe Christoph Paasch 2020-01-21 460 * opt even on mptcp enabled paths d22f4988ffecbe Christoph Paasch 2020-01-21 461 */ 58b09919626bf9 Paolo Abeni 2020-03-13 462 goto create_msk; d22f4988ffecbe Christoph Paasch 2020-01-21 463 } d22f4988ffecbe Christoph Paasch 2020-01-21 464 cfde141ea3faa3 Paolo Abeni 2020-04-30 465 mptcp_get_options(skb, &mp_opt); cfde141ea3faa3 Paolo Abeni 2020-04-30 466 if (!mp_opt.mp_capable) { 4c8941de781cf7 Paolo Abeni 2020-04-20 467 fallback = true; 58b09919626bf9 Paolo Abeni 2020-03-13 468 goto create_child; d22f4988ffecbe Christoph Paasch 2020-01-21 469 } 58b09919626bf9 Paolo Abeni 2020-03-13 470 58b09919626bf9 Paolo Abeni 2020-03-13 471 create_msk: cfde141ea3faa3 Paolo Abeni 2020-04-30 472 new_msk = mptcp_sk_clone(listener->conn, &mp_opt, req); 58b09919626bf9 Paolo Abeni 2020-03-13 473 if (!new_msk) 4c8941de781cf7 Paolo Abeni 2020-04-20 474 fallback = true; f296234c98a8fc Peter Krystad 2020-03-27 475 } else if (subflow_req->mp_join) { f296234c98a8fc Peter Krystad 2020-03-27 476 fallback_is_fatal = true; cfde141ea3faa3 Paolo Abeni 2020-04-30 477 mptcp_get_options(skb, &mp_opt); cfde141ea3faa3 Paolo Abeni 2020-04-30 478 if (!mp_opt.mp_join || cfde141ea3faa3 Paolo Abeni 2020-04-30 479 !subflow_hmac_valid(req, &mp_opt)) { fc518953bc9c8d Florian Westphal 2020-03-27 480 SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_JOINACKMAC); f296234c98a8fc Peter Krystad 2020-03-27 481 return NULL; cc7972ea193233 Christoph Paasch 2020-01-21 482 } fc518953bc9c8d Florian Westphal 2020-03-27 483 } cec37a6e41aae7 Peter Krystad 2020-01-21 484 d22f4988ffecbe Christoph Paasch 2020-01-21 485 create_child: ^^^^^^^^^^^^ cec37a6e41aae7 Peter Krystad 2020-01-21 486 child = listener->icsk_af_ops->syn_recv_sock(sk, skb, req, dst, cec37a6e41aae7 Peter Krystad 2020-01-21 487 req_unhash, own_req); cec37a6e41aae7 Peter Krystad 2020-01-21 488 cec37a6e41aae7 Peter Krystad 2020-01-21 489 if (child && *own_req) { 79c0949e9a09f6 Peter Krystad 2020-01-21 490 struct mptcp_subflow_context *ctx = mptcp_subflow_ctx(child); 79c0949e9a09f6 Peter Krystad 2020-01-21 491 90bf45134d55d6 Paolo Abeni 2020-05-15 492 tcp_rsk(req)->drop_req = false; 90bf45134d55d6 Paolo Abeni 2020-05-15 493 4c8941de781cf7 Paolo Abeni 2020-04-20 494 /* we need to fallback on ctx allocation failure and on pre-reqs 4c8941de781cf7 Paolo Abeni 2020-04-20 495 * checking above. In the latter scenario we additionally need 4c8941de781cf7 Paolo Abeni 2020-04-20 496 * to reset the context to non MPTCP status. 79c0949e9a09f6 Peter Krystad 2020-01-21 497 */ 4c8941de781cf7 Paolo Abeni 2020-04-20 498 if (!ctx || fallback) { f296234c98a8fc Peter Krystad 2020-03-27 499 if (fallback_is_fatal) 729cd6436f359b Paolo Abeni 2020-05-15 500 goto dispose_child; 4c8941de781cf7 Paolo Abeni 2020-04-20 501 39884604b11692 Paolo Abeni 2020-05-29 502 subflow_drop_ctx(child); 58b09919626bf9 Paolo Abeni 2020-03-13 503 goto out; f296234c98a8fc Peter Krystad 2020-03-27 504 } 79c0949e9a09f6 Peter Krystad 2020-01-21 505 79c0949e9a09f6 Peter Krystad 2020-01-21 506 if (ctx->mp_capable) { 58b09919626bf9 Paolo Abeni 2020-03-13 507 /* new mpc subflow takes ownership of the newly 58b09919626bf9 Paolo Abeni 2020-03-13 508 * created mptcp socket 58b09919626bf9 Paolo Abeni 2020-03-13 509 */ df1036da90108b Florian Westphal 2020-04-17 510 new_msk->sk_destruct = mptcp_sock_destruct; 1b1c7a0ef7f323 Peter Krystad 2020-03-27 511 mptcp_pm_new_connection(mptcp_sk(new_msk), 1); 962c918a1ca255 Paolo Abeni 2020-06-05 @512 mptcp_token_accept(subflow_req, mptcp_sk(new_msk)); ^^^^^^^^^^^ Potential uninitialized?