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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 E43F6C4724C for ; Mon, 4 May 2020 18:06:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BD09F206B8 for ; Mon, 4 May 2020 18:06:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588615605; bh=23r7fieUlnC6uLKY3WsafJurncmV9INLMJ5LgJujMXY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Y8v0aHQBZzu8aeaQd74Qho3iBYWd4mnn3+fztpEMePoYD0NFo8blpkasolcMsn2+M 0II6UCW6LbD4zOVSsLdmTkCegbjkzr9eYsSg66diaWMC0A8XCDy8e06NIHNJMJhPXP ezA7y3Gzas8QGu/jyGwOsPJEvbUHT1xXCdrdI+mY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732012AbgEDSGo (ORCPT ); Mon, 4 May 2020 14:06:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:37064 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731997AbgEDSGh (ORCPT ); Mon, 4 May 2020 14:06:37 -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 5133C2073E; Mon, 4 May 2020 18:06:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588615596; bh=23r7fieUlnC6uLKY3WsafJurncmV9INLMJ5LgJujMXY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FZjJchZBrMmA1oe1Ys2wx+Y2xDmIfDY3WmchCfEOMuhm5tG/3IGurmoRH62FMtM/i xCeZcnU3c4Ks08PGDQ9Hhf39BdVyTpZPk5yRY/UK3vTM3g7QTWWv2xDG5ZowiTW4qp tkLXzVasGuOgU4bGYN9Md7qGdEvGt7XoeAOXMbN8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xiyu Yang , Jason Gunthorpe Subject: [PATCH 5.6 46/73] RDMA/siw: Fix potential siw_mem refcnt leak in siw_fastreg_mr() Date: Mon, 4 May 2020 19:57:49 +0200 Message-Id: <20200504165508.850028018@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200504165501.781878940@linuxfoundation.org> References: <20200504165501.781878940@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: Jason Gunthorpe commit 6e051971b0e2eeb0ce7ec65d3cc8180450512d36 upstream. siw_fastreg_mr() invokes siw_mem_id2obj(), which returns a local reference of the siw_mem object to "mem" with increased refcnt. When siw_fastreg_mr() returns, "mem" becomes invalid, so the refcount should be decreased to keep refcount balanced. The issue happens in one error path of siw_fastreg_mr(). When "base_mr" equals to NULL but "mem" is not NULL, the function forgets to decrease the refcnt increased by siw_mem_id2obj() and causes a refcnt leak. Reorganize the flow so that the goto unwind can be used as expected. Fixes: b9be6f18cf9e ("rdma/siw: transmit path") Link: https://lore.kernel.org/r/1586939949-69856-1-git-send-email-xiyuyang19@fudan.edu.cn Reported-by: Xiyu Yang Signed-off-by: Jason Gunthorpe Signed-off-by: Greg Kroah-Hartman --- drivers/infiniband/sw/siw/siw_qp_tx.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) --- a/drivers/infiniband/sw/siw/siw_qp_tx.c +++ b/drivers/infiniband/sw/siw/siw_qp_tx.c @@ -920,20 +920,27 @@ static int siw_fastreg_mr(struct ib_pd * { struct ib_mr *base_mr = (struct ib_mr *)(uintptr_t)sqe->base_mr; struct siw_device *sdev = to_siw_dev(pd->device); - struct siw_mem *mem = siw_mem_id2obj(sdev, sqe->rkey >> 8); + struct siw_mem *mem; int rv = 0; siw_dbg_pd(pd, "STag 0x%08x\n", sqe->rkey); - if (unlikely(!mem || !base_mr)) { + if (unlikely(!base_mr)) { pr_warn("siw: fastreg: STag 0x%08x unknown\n", sqe->rkey); return -EINVAL; } + if (unlikely(base_mr->rkey >> 8 != sqe->rkey >> 8)) { pr_warn("siw: fastreg: STag 0x%08x: bad MR\n", sqe->rkey); - rv = -EINVAL; - goto out; + return -EINVAL; + } + + mem = siw_mem_id2obj(sdev, sqe->rkey >> 8); + if (unlikely(!mem)) { + pr_warn("siw: fastreg: STag 0x%08x unknown\n", sqe->rkey); + return -EINVAL; } + if (unlikely(mem->pd != pd)) { pr_warn("siw: fastreg: PD mismatch\n"); rv = -EINVAL;