From nobody Fri Jan 2 13:52:28 2026 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 00454CD98E3 for ; Wed, 11 Oct 2023 01:34:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344512AbjJKBeV (ORCPT ); Tue, 10 Oct 2023 21:34:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38818 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344233AbjJKBeU (ORCPT ); Tue, 10 Oct 2023 21:34:20 -0400 Received: from m15.mail.163.com (m15.mail.163.com [45.254.50.219]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id A5D7691 for ; Tue, 10 Oct 2023 18:34:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=WIGsW AH/iA3oJPpW3K+uYoJ9SzV46v5QlbmbaUJ1e3A=; b=hpwCytQPT6y4uIuhxlcTO GtPuYOYjDD4hpsUMwH76G9WQ0RHFIH55gSiHAaYxgALiZYmgxl7vXuxKeRJVE5VJ 3P7DcdplD+F9++G75VdRhgIXvmZbtmzV9uP6zEriNnfUNp8LntZLx3xLA6Jn2Wun gtcZoaL0/KywX40nw25AEw= Received: from icess-ProLiant-DL380-Gen10.. (unknown [183.174.60.14]) by zwqz-smtp-mta-g0-2 (Coremail) with SMTP id _____wDn76Jd+yVlvWboAA--.39607S4; Wed, 11 Oct 2023 09:33:24 +0800 (CST) From: Ma Ke To: maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, daniel@ffwll.ch Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Ma Ke Subject: [PATCH] drm/edid: fix a possible null pointer dereference Date: Wed, 11 Oct 2023 09:33:16 +0800 Message-Id: <20231011013316.4091845-1-make_ruc2021@163.com> X-Mailer: git-send-email 2.37.2 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: _____wDn76Jd+yVlvWboAA--.39607S4 X-Coremail-Antispam: 1Uf129KBjvdXoWrurW5Zr1fAry7KF4Uuw48Zwb_yoW3Wwc_uF y8X39xGrnrua48ArsrZayfZrySyF1rZFW8Gr1Uta4Sy3yDCF15J347KFnYqryxWa1jyF9r Ja4Uua1fCF47GjkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7xRKhL07UUUUU== X-Originating-IP: [183.174.60.14] X-CM-SenderInfo: 5pdnvshuxfjiisr6il2tof0z/1tbiyAUGC1p7MF401AAAsv Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" In drm_mode_std(), the return value of drm_gtf_mode(), drm_gtf_mode() and drm_cvt_mode() is assigned to mode, which will lead to a NULL pointer dereference on failure of drm_gtf_mode(), drm_gtf_mode() and drm_cvt_mode(). Add a check to avoid null point dereference. Signed-off-by: Ma Ke --- drivers/gpu/drm/drm_edid.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 340da8257b51..e2c154c2b896 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -3381,6 +3381,8 @@ static struct drm_display_mode *drm_mode_std(struct d= rm_connector *connector, false); break; } + if (!mode) + return NULL; return mode; } =20 --=20 2.37.2