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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 D3660C48BD6 for ; Thu, 27 Jun 2019 00:47:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9D5A4214DA for ; Thu, 27 Jun 2019 00:47:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561596451; bh=IC2S7997n6SUWPquy8Pvcq/JtfLi0QlfBLlHtyJ5Cik=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Sn3U3dNHDJF5JNbDbHm4yfO9R1DuzAan2wnc8FF2wKNTyGPASbPzp6XUKquJvp6t8 ujYEIkUxvFEVwzHZ4L8Fefc47AuWn35buqvyJt1f91xBqaVADtDgkuG/9LBPvcLvqd 26K00gjX61FL/4Th07epftOk8AvY10QVKX56ZKB0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728957AbfF0Ara (ORCPT ); Wed, 26 Jun 2019 20:47:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:43296 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726862AbfF0AjE (ORCPT ); Wed, 26 Jun 2019 20:39:04 -0400 Received: from sasha-vm.mshome.net (unknown [107.242.116.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 552C0217F9; Thu, 27 Jun 2019 00:39:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561595943; bh=IC2S7997n6SUWPquy8Pvcq/JtfLi0QlfBLlHtyJ5Cik=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eodeiXpVgXjAo+mmhDfpM1RgjJ0LSFA5IMuN3xVVNytCRcVudd1jSsr4Zd7nj2rw1 Wz9fxOP5Y8ibzdSh5146dxkk1gk6P1TmBavcimBjoZDsU+JKPYa7OTfDTP4MupOPbh jbWXrXygiHdsWgwDlSdxyurtC63Hl+yraChFB+ok= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Dan Carpenter , Sean Paul , Sasha Levin , dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 4.19 53/60] drm: return -EFAULT if copy_to_user() fails Date: Wed, 26 Jun 2019 20:36:08 -0400 Message-Id: <20190627003616.20767-53-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190627003616.20767-1-sashal@kernel.org> References: <20190627003616.20767-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dan Carpenter [ Upstream commit 74b67efa8d7b4f90137f0ab9a80dd319da050350 ] The copy_from_user() function returns the number of bytes remaining to be copied but we want to return a negative error code. Otherwise the callers treat it as a successful copy. Signed-off-by: Dan Carpenter Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/20190618131843.GA29463@mwanda Signed-off-by: Sasha Levin --- drivers/gpu/drm/drm_bufs.c | 5 ++++- drivers/gpu/drm/drm_ioc32.c | 5 ++++- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c index e2f775d1c112..21bec4548092 100644 --- a/drivers/gpu/drm/drm_bufs.c +++ b/drivers/gpu/drm/drm_bufs.c @@ -1321,7 +1321,10 @@ static int copy_one_buf(void *data, int count, struct drm_buf_entry *from) .size = from->buf_size, .low_mark = from->low_mark, .high_mark = from->high_mark}; - return copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags)); + + if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags))) + return -EFAULT; + return 0; } int drm_legacy_infobufs(struct drm_device *dev, void *data, diff --git a/drivers/gpu/drm/drm_ioc32.c b/drivers/gpu/drm/drm_ioc32.c index 67b1fca39aa6..138680b37c70 100644 --- a/drivers/gpu/drm/drm_ioc32.c +++ b/drivers/gpu/drm/drm_ioc32.c @@ -372,7 +372,10 @@ static int copy_one_buf32(void *data, int count, struct drm_buf_entry *from) .size = from->buf_size, .low_mark = from->low_mark, .high_mark = from->high_mark}; - return copy_to_user(to + count, &v, offsetof(drm_buf_desc32_t, flags)); + + if (copy_to_user(to + count, &v, offsetof(drm_buf_desc32_t, flags))) + return -EFAULT; + return 0; } static int drm_legacy_infobufs32(struct drm_device *dev, void *data, -- 2.20.1