From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D5FB2C433E1 for ; Mon, 24 Aug 2020 08:40:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9216C2075B for ; Mon, 24 Aug 2020 08:40:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598258448; bh=OoNOYyVcBqHtuU3jcJNjtmLrgGP7luC9MQmdDUnLJTI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=jR2YCz7vKgB6yc8l0fIgKkN5New1nbTWvjuzPL1LAKdQm9JbtzI+6Jif7JeM2pQQd 6NtQGJDipdraNPrabVJxVcRUOYuU4Y1kJoXnPJq9zfpKr6cwSj2a6eDSP0BNYt0bxm 0z8AdaxNf+eG6OUynmzfEmQx61S4TZvL1zjnLzoA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728777AbgHXIkq (ORCPT ); Mon, 24 Aug 2020 04:40:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:57428 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728747AbgHXIk2 (ORCPT ); Mon, 24 Aug 2020 04:40:28 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4912E2074D; Mon, 24 Aug 2020 08:40:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598258427; bh=OoNOYyVcBqHtuU3jcJNjtmLrgGP7luC9MQmdDUnLJTI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LcklCeW+N045uuqYQR9GKrjpCzyuFVqIiq9AtKbVIXs5tk33Yfiv2Nua1y9/hdcyF QM+R3uG0ucjPzZIFwkhkLSt0x//rPZOqY7PAmqHdgnQB3uquZPIi+dP3pgAOrlNPlT F03BxYteqZcbo9Vril/9blbjqyJvCQKeQFXOhbdU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chuck Lever , Sasha Levin Subject: [PATCH 5.7 044/124] svcrdma: Fix another Receive buffer leak Date: Mon, 24 Aug 2020 10:29:38 +0200 Message-Id: <20200824082411.593157141@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200824082409.368269240@linuxfoundation.org> References: <20200824082409.368269240@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Chuck Lever [ Upstream commit 64d26422516b2e347b32e6d9b1d40b3c19a62aae ] During a connection tear down, the Receive queue is flushed before the device resources are freed. Typically, all the Receives flush with IB_WR_FLUSH_ERR. However, any pending successful Receives flush with IB_WR_SUCCESS, and the server automatically posts a fresh Receive to replace the completing one. This happens even after the connection has closed and the RQ is drained. Receives that are posted after the RQ is drained appear never to complete, causing a Receive resource leak. The leaked Receive buffer is left DMA-mapped. To prevent these late-posted recv_ctxt's from leaking, block new Receive posting after XPT_CLOSE is set. Signed-off-by: Chuck Lever Signed-off-by: Sasha Levin --- net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c index efa5fcb5793f7..952b8f1908500 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c +++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c @@ -265,6 +265,8 @@ static int svc_rdma_post_recv(struct svcxprt_rdma *rdma) { struct svc_rdma_recv_ctxt *ctxt; + if (test_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags)) + return 0; ctxt = svc_rdma_recv_ctxt_get(rdma); if (!ctxt) return -ENOMEM; -- 2.25.1