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 0E702C43217 for ; Tue, 26 Apr 2022 08:34:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345001AbiDZIhj (ORCPT ); Tue, 26 Apr 2022 04:37:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36850 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345280AbiDZIe2 (ORCPT ); Tue, 26 Apr 2022 04:34:28 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 19A6873063; Tue, 26 Apr 2022 01:26:57 -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 A97AB617F1; Tue, 26 Apr 2022 08:26:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B87EEC385AC; Tue, 26 Apr 2022 08:26:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650961616; bh=XEncWXOOTgqkk9+t/TZHK1gvF3HW9nBti41MaEMdk0s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VAt8+Xo6uAuJ7B6tHuMRxYp13DRYtsZWQHXaaW+lVNFWXmi63MvoPe0kHGbVw0sMT zYkILQjpAtYRJSbqlP9mEuivdZ1L7gOPXGAZOk/kUYjKA2QU4nQI4VwiKyFav6k2EE lLDQ/s9Qx96oFO8FW/tYUWRKkdEiN/mXnqaGAJpY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xiaoke Wang , Dmitry Baryshkov , Rob Clark , Sasha Levin Subject: [PATCH 4.19 26/53] drm/msm/mdp5: check the return of kzalloc() Date: Tue, 26 Apr 2022 10:21:06 +0200 Message-Id: <20220426081736.415772090@linuxfoundation.org> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220426081735.651926456@linuxfoundation.org> References: <20220426081735.651926456@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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/disp/mdp5/mdp5_plane.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c index 1ddf07514de6..3d8eaa25bea0 100644 --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c @@ -188,7 +188,10 @@ 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