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=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 AFFDDC433E4 for ; Tue, 26 May 2020 19:30:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8F279208B8 for ; Tue, 26 May 2020 19:30:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590521455; bh=5d5t+nP+N3uFasCIiJv9TMljTbF1AUjhVSa9D3tZzYY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=XQTcxMHGh08yDU9q3teNaDKUKmvEoQDuijmhdObY5DpT8XgwMjMoFWeCsTrDEYB6r Woo/wawsHO4RtapTE0LzjrzLsU1q5W4gkkkIG0de74QRaMwOX/1r1FQAtfzPFyJP/T HlX3QKDc7crAbaX/NK8iGC63NuF4sZpcCRsrCDRk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392612AbgEZTaz (ORCPT ); Tue, 26 May 2020 15:30:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:53810 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390571AbgEZS7w (ORCPT ); Tue, 26 May 2020 14:59:52 -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 8018520849; Tue, 26 May 2020 18:59:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590519591; bh=5d5t+nP+N3uFasCIiJv9TMljTbF1AUjhVSa9D3tZzYY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cjwJeC60QHbBPXGxChtZeYrYhbv9D0IS2NKZHsiYxc/d18wShz1iJUkrjSrN4KRCo ULcgoZSpHuqpHEzIZA0ius1tZqHq0x7xTLaISc6O90PkgpAisbja8K89ksyLweEsnV 6n/2yNjzQEOWJCSNcfsFv+i6XKTAF5p4FW2T9ctE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, John Hubbard , Andrew Morton , Matt Porter , Alexandre Bounine , Sumit Semwal , Dan Carpenter , Linus Torvalds Subject: [PATCH 4.9 63/64] rapidio: fix an error in get_user_pages_fast() error handling Date: Tue, 26 May 2020 20:53:32 +0200 Message-Id: <20200526183931.658765886@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200526183913.064413230@linuxfoundation.org> References: <20200526183913.064413230@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: John Hubbard commit ffca476a0a8d26de767cc41d62b8ca7f540ecfdd upstream. In the case of get_user_pages_fast() returning fewer pages than requested, rio_dma_transfer() does not quite do the right thing. It attempts to release all the pages that were requested, rather than just the pages that were pinned. Fix the error handling so that only the pages that were successfully pinned are released. Fixes: e8de370188d0 ("rapidio: add mport char device driver") Signed-off-by: John Hubbard Signed-off-by: Andrew Morton Reviewed-by: Andrew Morton Cc: Matt Porter Cc: Alexandre Bounine Cc: Sumit Semwal Cc: Dan Carpenter Cc: Link: http://lkml.kernel.org/r/20200517235620.205225-2-jhubbard@nvidia.com Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- drivers/rapidio/devices/rio_mport_cdev.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/rapidio/devices/rio_mport_cdev.c +++ b/drivers/rapidio/devices/rio_mport_cdev.c @@ -905,6 +905,11 @@ rio_dma_transfer(struct file *filp, u32 rmcd_error("pinned %ld out of %ld pages", pinned, nr_pages); ret = -EFAULT; + /* + * Set nr_pages up to mean "how many pages to unpin, in + * the error handler: + */ + nr_pages = pinned; goto err_pg; }