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 B185DC433EF for ; Tue, 19 Apr 2022 18:26:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1357637AbiDSS21 (ORCPT ); Tue, 19 Apr 2022 14:28:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37558 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1357671AbiDSSXj (ORCPT ); Tue, 19 Apr 2022 14:23:39 -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 1F58144A18; Tue, 19 Apr 2022 11:16:46 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 3D0D56133F; Tue, 19 Apr 2022 18:16:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4E19BC385A7; Tue, 19 Apr 2022 18:16:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1650392204; bh=YzDiLu9ddEYgQ9ntmiI/RkK4sDXt+4979qYJ8zeaSKY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QEmmyvU0OKnbCvEYZ+rIokU3mUMs8yrws0gkqCtvWOOPp3vaApNhFKsMmVDojMWQV uIa1GqGTaumwW6MdYPDyf/2iBUZDLjP2MoHxu639mWN9/mxn8OnfzkGMXwcLGN25h3 QFG0s6uTMlf/VsmkiDBSwMOo8Yt4JvR8Q/N1bkGU7rWCwvCAgbsBVaMnRMO/ZY3szQ wZj20klISqypfJ5rWkil2/Gqr4ivY9eEDmKrtdTJVkeUIacr/7sgEuhZXkZs8j+p3U RxRub4G+cKkc8XCwYCGDul6z1pjzyaDJUrTCGg7UdEzx9rIbPcRU5BTiK5lw4VovTl Fal4Kq3yIlpaA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Xiaoke Wang , Dmitry Baryshkov , Rob Clark , Sasha Levin , robdclark@gmail.com, sean@poorly.run, airlied@linux.ie, daniel@ffwll.ch, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org Subject: [PATCH AUTOSEL 4.9 7/7] drm/msm/mdp5: check the return of kzalloc() Date: Tue, 19 Apr 2022 14:16:25 -0400 Message-Id: <20220419181625.486476-7-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220419181625.486476-1-sashal@kernel.org> References: <20220419181625.486476-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Xiaoke Wang [ Upstream commit 047ae665577776b7feb11bd4f81f46627cff95e7 ] kzalloc() is a memory allocation function which can return NULL when some internal memory errors happen. So it is better to check it to prevent potential wrong memory access. Besides, since mdp5_plane_reset() is void type, so we should better set `plane-state` to NULL after releasing it. Signed-off-by: Xiaoke Wang Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/481055/ Link: https://lore.kernel.org/r/tencent_8E2A1C78140EE1784AB2FF4B2088CC0AB908@qq.com Signed-off-by: Dmitry Baryshkov Signed-off-by: Rob Clark Signed-off-by: Sasha Levin --- drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c index 83bf997dda03..e14bfbdbaf2b 100644 --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c @@ -192,7 +192,10 @@ static void mdp5_plane_reset(struct drm_plane *plane) drm_framebuffer_unreference(plane->state->fb); kfree(to_mdp5_plane_state(plane->state)); + plane->state = NULL; mdp5_state = kzalloc(sizeof(*mdp5_state), GFP_KERNEL); + if (!mdp5_state) + return; /* assign default blend parameters */ mdp5_state->alpha = 255; -- 2.35.1