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=-6.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS 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 0FC68C31E5C for ; Mon, 17 Jun 2019 15:31:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D37BE20833 for ; Mon, 17 Jun 2019 15:31:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="KCUmn+a8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726716AbfFQPbm (ORCPT ); Mon, 17 Jun 2019 11:31:42 -0400 Received: from mail-io1-f67.google.com ([209.85.166.67]:42942 "EHLO mail-io1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725863AbfFQPbm (ORCPT ); Mon, 17 Jun 2019 11:31:42 -0400 Received: by mail-io1-f67.google.com with SMTP id u19so22044473ior.9; Mon, 17 Jun 2019 08:31:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:subject:from:to:cc:date:message-id:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=to3mUAty1JalteouLQzDvBtpnJX/PiznlXHIlSo5tHE=; b=KCUmn+a8Mb3ukugBgrOPLRGvZrwwAl6/fmh/fiu407z/wTaGr6Hexf8wCYtg+HUo5E kh1y+lF59n2auxm7SKnLc6/DNVXuhTf+N6iH3yV7f6dOM65k3zDWOX3DsVhwgUbAeGf8 KNib9YLjF1lvLvN6xcXrK5PvCkv3vSXDv0J63TCA8XoULHXhddB3VchozWnJOzUQJM/S cBjn/pcZ31MCGPWGE9yilEVZ05TMPRv2NDqofSMuUJyVSB9N+poYmNr3R2eFV+BfPFii Qy0ispiCjiG+gfjskXG/y2EO5hF8GXbeba53lkf0mo7KEYUFxntkVAmOudoU+C5XtQ74 lslQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:subject:from:to:cc:date:message-id :in-reply-to:references:user-agent:mime-version :content-transfer-encoding; bh=to3mUAty1JalteouLQzDvBtpnJX/PiznlXHIlSo5tHE=; b=KVm+j4x9WWzE94f5c9jZQ6kRyg5gKX0QD4v2OnKPWmXAc25JAnDwiDhjASsdgA0YGB kcPI2gCjGejNt/tksXN0CcYRNDPyvjM906gjPB11KxuCKr4pxn344zNjB7VbIitiofEL 7YPUqI0HXGW01QXYkhVznRdrrAf0WdqFiozA4/21Wm3BljC2P5zR++ulgwbLhebcFgxS O/XbN+J+9Fa7jzZYbID7ZhEHDTuTPmNJhrtCQDZ6CNlofNO4QsHi9j4fBcEdAIUxk4mR 9s4rf83E8ZKQw8M1ligttyn0KmOQqb/fRzP1BFzWpQzvG+uwT1oicUtbSZLzpSFcS6p3 TJOg== X-Gm-Message-State: APjAAAXWOFcBYFQLrdUiI2rsRurenPJIURSq80tGQ7nW7+ATh2unSqrh saqPSCxzQ42noWe6cauF+iiPHHxt X-Google-Smtp-Source: APXvYqxbm+HuiXCI6+T76DNK3OHc/G2rHS6jP7d4BJZMKS5q1y4CLcp+20xco1WhgBWP+H7QdNPt2w== X-Received: by 2002:a6b:cd86:: with SMTP id d128mr55753916iog.234.1560785501390; Mon, 17 Jun 2019 08:31:41 -0700 (PDT) Received: from gateway.1015granger.net (c-68-61-232-219.hsd1.mi.comcast.net. [68.61.232.219]) by smtp.gmail.com with ESMTPSA id j23sm11524057ioo.6.2019.06.17.08.31.40 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 17 Jun 2019 08:31:41 -0700 (PDT) Received: from manet.1015granger.net (manet.1015granger.net [192.168.1.51]) by gateway.1015granger.net (8.14.7/8.14.7) with ESMTP id x5HFVeKi031191; Mon, 17 Jun 2019 15:31:40 GMT Subject: [PATCH v3 02/19] xprtrdma: Fix use-after-free in rpcrdma_post_recvs From: Chuck Lever To: anna.schumaker@netapp.com Cc: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Date: Mon, 17 Jun 2019 11:31:40 -0400 Message-ID: <20190617153140.12090.57798.stgit@manet.1015granger.net> In-Reply-To: <20190617152657.12090.11389.stgit@manet.1015granger.net> References: <20190617152657.12090.11389.stgit@manet.1015granger.net> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Dereference wr->next /before/ the memory backing wr has been released. This issue was found by code inspection. It is not expected to be a significant problem because it is in an error path that is almost never executed. Fixes: 7c8d9e7c8863 ("xprtrdma: Move Receive posting to ... ") Signed-off-by: Chuck Lever --- net/sunrpc/xprtrdma/verbs.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index 84bb379..e71315e 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -1553,10 +1553,11 @@ static void rpcrdma_regbuf_free(struct rpcrdma_regbuf *rb) rc = ib_post_recv(r_xprt->rx_ia.ri_id->qp, wr, (const struct ib_recv_wr **)&bad_wr); if (rc) { - for (wr = bad_wr; wr; wr = wr->next) { + for (wr = bad_wr; wr;) { struct rpcrdma_rep *rep; rep = container_of(wr, struct rpcrdma_rep, rr_recv_wr); + wr = wr->next; rpcrdma_recv_buffer_put(rep); --count; }