From patchwork Tue Oct 27 13:49:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 311791 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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 2AFACC55178 for ; Tue, 27 Oct 2020 18:13:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D6715207E8 for ; Tue, 27 Oct 2020 18:13:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603822415; bh=KlIX4Zuge3JKWWb5x9A5J9f1tTIu1eUmKVRQhTo88UQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SwCldePrM3Xl6hX1FIj1oN01UNS/XE4rVM2sbqsCdOzJueyWJSh7xh2izJ699MVF/ nfDgVaHLdnOS/1jalbLpl6seH+Z7laHWsO0+gwiONM/L2ZJr8z/7EpACEXV6oVrmWi dwRzBlSfaU/FJ4awCXDIWOM/wCtIcwm70GB9DGw8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1825749AbgJ0SN1 (ORCPT ); Tue, 27 Oct 2020 14:13:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:35794 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756579AbgJ0OOS (ORCPT ); Tue, 27 Oct 2020 10:14:18 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 30B462076A; Tue, 27 Oct 2020 14:14:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603808057; bh=KlIX4Zuge3JKWWb5x9A5J9f1tTIu1eUmKVRQhTo88UQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dwDE7Tf8ewnBMhvBrLLL/y/CBEVrT39u+/oODf6Lp07JF94oSyuBkLPkk6A5LodvF hggfmT418n5M97e8fR+ad3Wzsa9AeKFw7x1YeQBC5OdEbkgJ0rmMRmAhFd2zHAcv5Q /2HF7OVxvOFbPIvBKUTxrykjIb8jaO1tPFTlsEw4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Souptick Joarder , Andrew Morton , Ira Weiny , John Hubbard , Matthew Wilcox , Matt Porter , Alexandre Bounine , "Gustavo A. R. Silva" , Madhuparna Bhowmik , Dan Carpenter , Linus Torvalds , Sasha Levin Subject: [PATCH 4.14 109/191] rapidio: fix error handling path Date: Tue, 27 Oct 2020 14:49:24 +0100 Message-Id: <20201027134914.942650270@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027134909.701581493@linuxfoundation.org> References: <20201027134909.701581493@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Souptick Joarder [ Upstream commit fa63f083b3492b5ed5332b8d7c90b03b5ef24a1d ] rio_dma_transfer() attempts to clamp the return value of pin_user_pages_fast() to be >= 0. However, the attempt fails because nr_pages is overridden a few lines later, and restored to the undesirable -ERRNO value. The return value is ultimately stored in nr_pages, which in turn is passed to unpin_user_pages(), which expects nr_pages >= 0, else, disaster. Fix this by fixing the nesting of the assignment to nr_pages: nr_pages should be clamped to zero if pin_user_pages_fast() returns -ERRNO, or set to the return value of pin_user_pages_fast(), otherwise. [jhubbard@nvidia.com: new changelog] Fixes: e8de370188d09 ("rapidio: add mport char device driver") Signed-off-by: Souptick Joarder Signed-off-by: Andrew Morton Reviewed-by: Ira Weiny Reviewed-by: John Hubbard Cc: Matthew Wilcox Cc: Matt Porter Cc: Alexandre Bounine Cc: Gustavo A. R. Silva Cc: Madhuparna Bhowmik Cc: Dan Carpenter Link: https://lkml.kernel.org/r/1600227737-20785-1-git-send-email-jrdr.linux@gmail.com Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- drivers/rapidio/devices/rio_mport_cdev.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c index f207f8725993c..171d6bcad5bc5 100644 --- a/drivers/rapidio/devices/rio_mport_cdev.c +++ b/drivers/rapidio/devices/rio_mport_cdev.c @@ -900,15 +900,16 @@ rio_dma_transfer(struct file *filp, u32 transfer_mode, rmcd_error("get_user_pages_unlocked err=%ld", pinned); nr_pages = 0; - } else + } else { rmcd_error("pinned %ld out of %ld pages", pinned, nr_pages); + /* + * Set nr_pages up to mean "how many pages to unpin, in + * the error handler: + */ + nr_pages = pinned; + } ret = -EFAULT; - /* - * Set nr_pages up to mean "how many pages to unpin, in - * the error handler: - */ - nr_pages = pinned; goto err_pg; }