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 80C51C34026 for ; Tue, 18 Feb 2020 20:01:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 588F72465A for ; Tue, 18 Feb 2020 20:01:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582056097; bh=jdgZpNdjBCoaVi1w16uWteitn7yXv88bqs3xbtmdmL0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=1k3oGVYdYgEjIc3peMBdhpUelVazjSBiaW6zIdpt1QU9xpuOZEuKCSqFH7ZsqfNZU YxTiJYCa5m80ak9Y4jlJxblk3uDdFgT5BtFZGPOhE54v2lAc/D22we8Q5pE56bG9bk Tmb5Yxhsvv8PU/dKjGLh2hxtOM5dhARVKycBv9fg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728793AbgBRUBf (ORCPT ); Tue, 18 Feb 2020 15:01:35 -0500 Received: from mail.kernel.org ([198.145.29.99]:41066 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728752AbgBRUB1 (ORCPT ); Tue, 18 Feb 2020 15:01:27 -0500 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 B351424672; Tue, 18 Feb 2020 20:01:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582056086; bh=jdgZpNdjBCoaVi1w16uWteitn7yXv88bqs3xbtmdmL0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=w+qserRSk2YiE6KIbSJng7wjz+ntHDf5nGEjsioiMTHWCf+vhxYugsixj467NjwL/ 1vclIYWq/X09nu2lLboofKky7XzEO1D2j+3nqe8+teNq7iCheDPiGGDX+EJsaWrY5Y dhPuHhkBRO+i9Hl0Zu6AM5sEYWQUEfEcRJxJmMzU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andre Tomt , Robin Murphy , Chuck Lever , Jason Gunthorpe , Anna Schumaker Subject: [PATCH 5.5 29/80] xprtrdma: Fix DMA scatter-gather list mapping imbalance Date: Tue, 18 Feb 2020 20:54:50 +0100 Message-Id: <20200218190435.228070609@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200218190432.043414522@linuxfoundation.org> References: <20200218190432.043414522@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 commit ca1c671302825182629d3c1a60363cee6f5455bb upstream. The @nents value that was passed to ib_dma_map_sg() has to be passed to the matching ib_dma_unmap_sg() call. If ib_dma_map_sg() choses to concatenate sg entries, it will return a different nents value than it was passed. The bug was exposed by recent changes to the AMD IOMMU driver, which enabled sg entry concatenation. Looking all the way back to commit 4143f34e01e9 ("xprtrdma: Port to new memory registration API") and reviewing other kernel ULPs, it's not clear that the frwr_map() logic was ever correct for this case. Reported-by: Andre Tomt Suggested-by: Robin Murphy Signed-off-by: Chuck Lever Cc: stable@vger.kernel.org Reviewed-by: Jason Gunthorpe Signed-off-by: Anna Schumaker Signed-off-by: Greg Kroah-Hartman --- net/sunrpc/xprtrdma/frwr_ops.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) --- a/net/sunrpc/xprtrdma/frwr_ops.c +++ b/net/sunrpc/xprtrdma/frwr_ops.c @@ -298,8 +298,8 @@ struct rpcrdma_mr_seg *frwr_map(struct r { struct rpcrdma_ia *ia = &r_xprt->rx_ia; struct ib_reg_wr *reg_wr; + int i, n, dma_nents; struct ib_mr *ibmr; - int i, n; u8 key; if (nsegs > ia->ri_max_frwr_depth) @@ -323,15 +323,16 @@ struct rpcrdma_mr_seg *frwr_map(struct r break; } mr->mr_dir = rpcrdma_data_dir(writing); + mr->mr_nents = i; - mr->mr_nents = - ib_dma_map_sg(ia->ri_id->device, mr->mr_sg, i, mr->mr_dir); - if (!mr->mr_nents) + dma_nents = ib_dma_map_sg(ia->ri_id->device, mr->mr_sg, mr->mr_nents, + mr->mr_dir); + if (!dma_nents) goto out_dmamap_err; ibmr = mr->frwr.fr_mr; - n = ib_map_mr_sg(ibmr, mr->mr_sg, mr->mr_nents, NULL, PAGE_SIZE); - if (unlikely(n != mr->mr_nents)) + n = ib_map_mr_sg(ibmr, mr->mr_sg, dma_nents, NULL, PAGE_SIZE); + if (n != dma_nents) goto out_mapmr_err; ibmr->iova &= 0x00000000ffffffff;