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 29A97CCA486 for ; Tue, 7 Jun 2022 19:18:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350488AbiFGTSP (ORCPT ); Tue, 7 Jun 2022 15:18:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54678 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356040AbiFGTRx (ORCPT ); Tue, 7 Jun 2022 15:17:53 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 353AD30F42; Tue, 7 Jun 2022 11:08:14 -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 3A038617AE; Tue, 7 Jun 2022 18:08:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 47C77C385A5; Tue, 7 Jun 2022 18:08:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1654625291; bh=u3BGt4PKsLXxAzxsq/aZZArjOH52aSbr80e3Qobz3pY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=z0tB2lUZa/pw4u20qFYIZ/QgoDr5w0GZTYfb57NcPkok73AYArmiP+fknV4DZFXrN hrFi1exMbkmrQM2Z7h0V+7cMzrK2WIiDrN9575rzGWfOM2fwnPRjtmxw3ut6yDYhfJ 09rkOgikpQuvOGTz2iDb1Le46wOIRzkTQDry85ZY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xiaomeng Tong , Jyri Sarha Subject: [PATCH 5.15 634/667] tilcdc: tilcdc_external: fix an incorrect NULL check on list iterator Date: Tue, 7 Jun 2022 19:04:59 +0200 Message-Id: <20220607164953.679045039@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220607164934.766888869@linuxfoundation.org> References: <20220607164934.766888869@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: stable@vger.kernel.org From: Xiaomeng Tong commit 8b917cbe38e9b0d002492477a9fc2bfee2412ce4 upstream. The bug is here: if (!encoder) { The list iterator value 'encoder' will *always* be set and non-NULL by list_for_each_entry(), so it is incorrect to assume that the iterator value will be NULL if the list is empty or no element is found. To fix the bug, use a new variable 'iter' as the list iterator, while use the original variable 'encoder' as a dedicated pointer to point to the found element. Cc: stable@vger.kernel.org Fixes: ec9eab097a500 ("drm/tilcdc: Add drm bridge support for attaching drm bridge drivers") Signed-off-by: Xiaomeng Tong Reviewed-by: Jyri Sarha Tested-by: Jyri Sarha Signed-off-by: Jyri Sarha Link: https://patchwork.freedesktop.org/patch/msgid/20220327061516.5076-1-xiam0nd.tong@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/tilcdc/tilcdc_external.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) --- a/drivers/gpu/drm/tilcdc/tilcdc_external.c +++ b/drivers/gpu/drm/tilcdc/tilcdc_external.c @@ -60,11 +60,13 @@ struct drm_connector *tilcdc_encoder_fin int tilcdc_add_component_encoder(struct drm_device *ddev) { struct tilcdc_drm_private *priv = ddev->dev_private; - struct drm_encoder *encoder; + struct drm_encoder *encoder = NULL, *iter; - list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head) - if (encoder->possible_crtcs & (1 << priv->crtc->index)) + list_for_each_entry(iter, &ddev->mode_config.encoder_list, head) + if (iter->possible_crtcs & (1 << priv->crtc->index)) { + encoder = iter; break; + } if (!encoder) { dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);