From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BDB11199AB for ; Mon, 9 Oct 2023 13:34:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="maZMXcjl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36002C433CA; Mon, 9 Oct 2023 13:34:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696858455; bh=wVs9kkjnTTvQrDrjmZk2Ol8gsgTnSfUtlyZwICv5hE0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=maZMXcjlhUnR2pfYZrAHFwNBd7XQYv7cCAaHhxURqN2cbE/m6ihQdz8GB7CBzaaC7 PsRs/gaWsq20Bw52gmOHpBxxMR5febgWM7mM3JnqlfO4HsIv8pmzjWEti2AiV9cYdv ptJx7M2ul5rVGVvx9u20qSNaMZ7xT5JHPD3vE6nM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Bernard Metzler , Leon Romanovsky Subject: [PATCH 5.4 127/131] RDMA/siw: Fix connection failure handling Date: Mon, 9 Oct 2023 15:02:47 +0200 Message-ID: <20231009130120.307007624@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231009130116.329529591@linuxfoundation.org> References: <20231009130116.329529591@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Bernard Metzler commit 53a3f777049771496f791504e7dc8ef017cba590 upstream. In case immediate MPA request processing fails, the newly created endpoint unlinks the listening endpoint and is ready to be dropped. This special case was not handled correctly by the code handling the later TCP socket close, causing a NULL dereference crash in siw_cm_work_handler() when dereferencing a NULL listener. We now also cancel the useless MPA timeout, if immediate MPA request processing fails. This patch furthermore simplifies MPA processing in general: Scheduling a useless TCP socket read in sk_data_ready() upcall is now surpressed, if the socket is already moved out of TCP_ESTABLISHED state. Fixes: 6c52fdc244b5 ("rdma/siw: connection management") Signed-off-by: Bernard Metzler Link: https://lore.kernel.org/r/20230905145822.446263-1-bmt@zurich.ibm.com Signed-off-by: Leon Romanovsky Signed-off-by: Greg Kroah-Hartman --- drivers/infiniband/sw/siw/siw_cm.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) --- a/drivers/infiniband/sw/siw/siw_cm.c +++ b/drivers/infiniband/sw/siw/siw_cm.c @@ -981,6 +981,7 @@ static void siw_accept_newconn(struct si siw_cep_put(cep); new_cep->listen_cep = NULL; if (rv) { + siw_cancel_mpatimer(new_cep); siw_cep_set_free(new_cep); goto error; } @@ -1105,9 +1106,12 @@ static void siw_cm_work_handler(struct w /* * Socket close before MPA request received. */ - siw_dbg_cep(cep, "no mpareq: drop listener\n"); - siw_cep_put(cep->listen_cep); - cep->listen_cep = NULL; + if (cep->listen_cep) { + siw_dbg_cep(cep, + "no mpareq: drop listener\n"); + siw_cep_put(cep->listen_cep); + cep->listen_cep = NULL; + } } } release_cep = 1; @@ -1230,7 +1234,11 @@ static void siw_cm_llp_data_ready(struct if (!cep) goto out; - siw_dbg_cep(cep, "state: %d\n", cep->state); + siw_dbg_cep(cep, "cep state: %d, socket state %d\n", + cep->state, sk->sk_state); + + if (sk->sk_state != TCP_ESTABLISHED) + goto out; switch (cep->state) { case SIW_EPSTATE_RDMA_MODE: