From nobody Sat Feb 7 15:48:51 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 80973C433FE for ; Wed, 19 Oct 2022 09:13:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233046AbiJSJNg (ORCPT ); Wed, 19 Oct 2022 05:13:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54090 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232637AbiJSJK5 (ORCPT ); Wed, 19 Oct 2022 05:10:57 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0E1B0C4DB9; Wed, 19 Oct 2022 02:02:33 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 7C92161825; Wed, 19 Oct 2022 09:02:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8E90CC433C1; Wed, 19 Oct 2022 09:02:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666170127; bh=SVGyauJPlNV9CwUJHeaBYDZmpQHU7dMSWq2bl8Wcheg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fCaPBBbxP023kNdTCIlsZDp8DveWT6QXLeEwTFuGGCOgsMt2IYKAnQ4n1Sf1FShV+ 7I5uyt/VYHvI32vpKh8mETZTcrSd9Q9usGR6n2fK2VbmL7JLLMyoKzyMjI/suDKueO 5qKHN3a9FmZn8Q8MPQsJOQgrqcFHBl6eF/xk+rdw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Olga Kornievskaia , Bernard Metzler , Leon Romanovsky , Sasha Levin Subject: [PATCH 6.0 538/862] RDMA/siw: Fix QP destroy to wait for all references dropped. Date: Wed, 19 Oct 2022 10:30:25 +0200 Message-Id: <20221019083313.726298309@linuxfoundation.org> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221019083249.951566199@linuxfoundation.org> References: <20221019083249.951566199@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Bernard Metzler [ Upstream commit a3c278807a459e6f50afee6971cabe74cccfb490 ] Delay QP destroy completion until all siw references to QP are dropped. The calling RDMA core will free QP structure after successful return from siw_qp_destroy() call, so siw must not hold any remaining reference to the QP upon return. A use-after-free was encountered in xfstest generic/460, while testing NFSoRDMA. Here, after a TCP connection drop by peer, the triggered siw_cm_work_handler got delayed until after QP destroy call, referencing a QP which has already freed. Fixes: 303ae1cdfdf7 ("rdma/siw: application interface") Reported-by: Olga Kornievskaia Signed-off-by: Bernard Metzler Link: https://lore.kernel.org/r/20220920082503.224189-1-bmt@zurich.ibm.com Signed-off-by: Leon Romanovsky Signed-off-by: Sasha Levin --- drivers/infiniband/sw/siw/siw.h | 1 + drivers/infiniband/sw/siw/siw_qp.c | 2 +- drivers/infiniband/sw/siw/siw_verbs.c | 3 +++ 3 files changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/sw/siw/siw.h b/drivers/infiniband/sw/siw/si= w.h index df03d84c6868..2f3a9cda3850 100644 --- a/drivers/infiniband/sw/siw/siw.h +++ b/drivers/infiniband/sw/siw/siw.h @@ -418,6 +418,7 @@ struct siw_qp { struct ib_qp base_qp; struct siw_device *sdev; struct kref ref; + struct completion qp_free; struct list_head devq; int tx_cpu; struct siw_qp_attrs attrs; diff --git a/drivers/infiniband/sw/siw/siw_qp.c b/drivers/infiniband/sw/siw= /siw_qp.c index 7e01f2438afc..e6f634971228 100644 --- a/drivers/infiniband/sw/siw/siw_qp.c +++ b/drivers/infiniband/sw/siw/siw_qp.c @@ -1342,6 +1342,6 @@ void siw_free_qp(struct kref *ref) vfree(qp->orq); =20 siw_put_tx_cpu(qp->tx_cpu); - + complete(&qp->qp_free); atomic_dec(&sdev->num_qp); } diff --git a/drivers/infiniband/sw/siw/siw_verbs.c b/drivers/infiniband/sw/= siw/siw_verbs.c index 8dedae7ae79e..3e814cfb298c 100644 --- a/drivers/infiniband/sw/siw/siw_verbs.c +++ b/drivers/infiniband/sw/siw/siw_verbs.c @@ -480,6 +480,8 @@ int siw_create_qp(struct ib_qp *ibqp, struct ib_qp_init= _attr *attrs, list_add_tail(&qp->devq, &sdev->qp_list); spin_unlock_irqrestore(&sdev->lock, flags); =20 + init_completion(&qp->qp_free); + return 0; =20 err_out_xa: @@ -624,6 +626,7 @@ int siw_destroy_qp(struct ib_qp *base_qp, struct ib_uda= ta *udata) qp->scq =3D qp->rcq =3D NULL; =20 siw_qp_put(qp); + wait_for_completion(&qp->qp_free); =20 return 0; } --=20 2.35.1