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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E6161C0015E for ; Mon, 26 Jun 2023 18:25:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231942AbjFZSZY (ORCPT ); Mon, 26 Jun 2023 14:25:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37706 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231864AbjFZSY5 (ORCPT ); Mon, 26 Jun 2023 14:24:57 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 96BB8273F for ; Mon, 26 Jun 2023 11:24:25 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 7700F60F4B for ; Mon, 26 Jun 2023 18:24:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 83A89C433C0; Mon, 26 Jun 2023 18:24:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1687803864; bh=5r/F6a1Myi58nLeOgxAiMCY1m5Gdsqjn2GihdUq/W7Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eLncfhyFYpbwVtIxLp8myAEaVpZn5rURb/uD4zlCYbnvK3ZKtBJfPew/oSMtFGo3j 3vwzf+hhvk/tAi0yZ3yyoKeFhYRQXzJANs+GC36VRxuI4He5mb15X26CZUn2nfwGB6 UFpXkVum97//bmC1eanVU67N5boMXaWbf4GsxQqU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Min Li , Andi Shyti , Inki Dae , Sasha Levin Subject: [PATCH 6.3 187/199] drm/exynos: fix race condition UAF in exynos_g2d_exec_ioctl Date: Mon, 26 Jun 2023 20:11:33 +0200 Message-ID: <20230626180813.934210455@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230626180805.643662628@linuxfoundation.org> References: <20230626180805.643662628@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Min Li [ Upstream commit 48bfd02569f5db49cc033f259e66d57aa6efc9a3 ] If it is async, runqueue_node is freed in g2d_runqueue_worker on another worker thread. So in extreme cases, if g2d_runqueue_worker runs first, and then executes the following if statement, there will be use-after-free. Signed-off-by: Min Li Reviewed-by: Andi Shyti Signed-off-by: Inki Dae Signed-off-by: Sasha Levin --- drivers/gpu/drm/exynos/exynos_drm_g2d.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c index ec784e58da5c1..414e585ec7dd0 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c @@ -1335,7 +1335,7 @@ int exynos_g2d_exec_ioctl(struct drm_device *drm_dev, void *data, /* Let the runqueue know that there is work to do. */ queue_work(g2d->g2d_workq, &g2d->runqueue_work); - if (runqueue_node->async) + if (req->async) goto out; wait_for_completion(&runqueue_node->complete); -- 2.39.2