From nobody Wed Dec 17 10:55:44 2025 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 38686C46CA3 for ; Tue, 28 Nov 2023 10:25:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234853AbjK1KYv (ORCPT ); Tue, 28 Nov 2023 05:24:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50082 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344290AbjK1KYk (ORCPT ); Tue, 28 Nov 2023 05:24:40 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4592919A6 for ; Tue, 28 Nov 2023 02:24:37 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3F636C433C7; Tue, 28 Nov 2023 10:24:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701167076; bh=T1VDwdVoznG4IGcAFm7TZYH0xfCY62bnXCmWs4ZMug8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Es823PGa7N8+2/RqZWUTPGalS09UBfOox7B6BdSAOKCoXn8PUOkUjypJJZ64fuzIo zMAB87ALQ3P2yVAo8iUbNumc2SBfTeZX6z7DLIz84dT2rRs6YSPPVTt3/MJ2WbqaK9 t6IFUAWO87PmVRy8jTpAjsXLvXi8JmMNvhNA3doYnUq/H/euKSzo0/zxJem0yfGK5D PQ4nsCURYrT/V9f69RJNyjuVvcbb4ND4+Ac43aL4fCSFupOYYM+GE8t4istKgBxGiE 541gLkQza0iC1Fx6ONRbh7xbpqSvAnM1z7cLyhs7vRoMSZEa60HJY2tmnUkdJ0kC94 Lx8k+YvoT6v4Q== From: Maxime Ripard Date: Tue, 28 Nov 2023 11:24:16 +0100 Subject: [PATCH v4 05/45] drm/connector: Check drm_connector_init pointers arguments MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20231128-kms-hdmi-connector-state-v4-5-c7602158306e@kernel.org> References: <20231128-kms-hdmi-connector-state-v4-0-c7602158306e@kernel.org> In-Reply-To: <20231128-kms-hdmi-connector-state-v4-0-c7602158306e@kernel.org> To: Maarten Lankhorst , Thomas Zimmermann , David Airlie , Daniel Vetter , Emma Anholt , Jonathan Corbet , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland Cc: Hans Verkuil , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-sunxi@lists.linux.dev, Maxime Ripard X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1029; i=mripard@kernel.org; h=from:subject:message-id; bh=T1VDwdVoznG4IGcAFm7TZYH0xfCY62bnXCmWs4ZMug8=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDKmp+y++fVU5/cIzv1tzXztP2P2vx3m9st/0q6cWNte2M agLmklO7ShlYRDjYpAVU2SJETZfEndq1utONr55MHNYmUCGMHBxCsBELm5j+MNl2NlnxjlVMZXv z+GJkn1ne/2eu2RavXKY/Ezpefc6m8eMDJMuH00x6BfoFTjeUq2VYb53F6tgkd9DB42sDwpNB5I tOAE= X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org All the drm_connector_init variants take at least a pointer to the device, connector and hooks implementation. However, none of them check their value before dereferencing those pointers which can lead to a NULL-pointer dereference if the author isn't careful. Let's test those pointers instead and error out if any is NULL. Signed-off-by: Maxime Ripard --- drivers/gpu/drm/drm_connector.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connecto= r.c index b0516505f7ae..2f60755dccdd 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -229,6 +229,9 @@ static int __drm_connector_init(struct drm_device *dev, struct ida *connector_ida =3D &drm_connector_enum_list[connector_type].ida; =20 + if (!dev || !connector || !funcs) + return -EINVAL; + WARN_ON(drm_drv_uses_atomic_modeset(dev) && (!funcs->atomic_destroy_state || !funcs->atomic_duplicate_state)); --=20 2.41.0