From patchwork Tue May 23 06:39:43 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeffy Chen X-Patchwork-Id: 9741969 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 695D16034C for ; Tue, 23 May 2017 06:40:07 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5B3EF28786 for ; Tue, 23 May 2017 06:40:07 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4FF132879F; Tue, 23 May 2017 06:40:07 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id E5CFE28789 for ; Tue, 23 May 2017 06:40:05 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 30B2E89FCC; Tue, 23 May 2017 06:40:02 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from regular1.263xmail.com (regular1.263xmail.com [211.150.99.135]) by gabe.freedesktop.org (Postfix) with ESMTPS id 94ADF89FCC for ; Tue, 23 May 2017 06:40:00 +0000 (UTC) Received: from jeffy.chen?rock-chips.com (unknown [192.168.167.152]) by regular1.263xmail.com (Postfix) with ESMTP id 60E331E1E5; Tue, 23 May 2017 14:39:52 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 Received: from localhost (localhost [127.0.0.1]) by smtp.263.net (Postfix) with ESMTP id 16782393; Tue, 23 May 2017 14:39:48 +0800 (CST) X-RL-SENDER: jeffy.chen@rock-chips.com X-FST-TO: linux-kernel@vger.kernel.org X-SENDER-IP: 103.29.142.67 X-LOGIN-NAME: jeffy.chen@rock-chips.com X-UNIQUE-TAG: <0bae9100edcc0038593b05c82201e63c> X-ATTACHMENT-NUM: 0 X-SENDER: cjf@rock-chips.com X-DNS-TYPE: 0 Received: from localhost (unknown [103.29.142.67]) by smtp.263.net (Postfix) whith ESMTP id 10072UC4OJH; Tue, 23 May 2017 14:39:52 +0800 (CST) From: Jeffy Chen To: linux-kernel@vger.kernel.org Subject: [PATCH] drm/rockchip: Don't allow zero sized gem buffer Date: Tue, 23 May 2017 14:39:43 +0800 Message-Id: <1495521583-29151-1-git-send-email-jeffy.chen@rock-chips.com> X-Mailer: git-send-email 2.1.4 Cc: Jeffy Chen , dri-devel@lists.freedesktop.org, tfiga@chromium.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP The system would crash when trying to alloc zero sized gem buffer: [ 6.712435] Unable to handle kernel NULL pointer dereference at virtual address 00000010 <--ZERO_SIZE_PTR ... [ 6.757502] PC is at sg_alloc_table_from_pages+0x170/0x1ec Signed-off-by: Jeffy Chen --- drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c index df9e570..8917922 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c @@ -315,6 +315,11 @@ struct rockchip_gem_object * struct drm_gem_object *obj; int ret; + if (!size) { + DRM_ERROR("gem buffer size is zero\n"); + return ERR_PTR(-EINVAL); + } + size = round_up(size, PAGE_SIZE); rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);