From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E5A7618801A; Tue, 30 Jul 2024 16:58:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722358682; cv=none; b=tuiovJvZlpMf31bAEmtsalbCP+MhsZHbpsYTiGArWUJNz7ARiCQvfhIILKpaCyGTm+RfNH832r2qQnvQY1VH0sPiukhPm4mrfGBApPSS7z9pTzKRByKuW8e7XY+VCOEP8imHxD+z9gr9oiRc089r/j7iVZlzt0gxStmN8KMJ3I4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722358682; c=relaxed/simple; bh=FEimZ++kVNIDNcvbdXHm02Y22dYQhGjUAD1cK1y8jTc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Lbh+NVIzWCpEl3q3AxttsaD45CvquSfgKkAN0C8qMy21cXGs1XYus5XC8J+zGEwvThxw91XKy7D1H6QJdwmpKc04YXCntfJzBT64Muq1R4UJ3/M3IWYDlWndfgVVp9ZYSt1zO6f0R60RNG5fi728rKWuewMpi+BzQX3gae6QMZc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=UMZqAEUh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="UMZqAEUh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 509C9C32782; Tue, 30 Jul 2024 16:58:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1722358681; bh=FEimZ++kVNIDNcvbdXHm02Y22dYQhGjUAD1cK1y8jTc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UMZqAEUhaGHI9B9ZCjsJsYEO0h9JYMOZm8C0V7VAJCrAhHzTpSSDivs7YFOZFQHFF 1thYlPKsny/9nnSsQxLDlFAhiGkHPvaV7CIcMuWsOhN3Y1mswpPmc5Guk3VZnllvuX pG4KSR1izWOeULI1qs6QL6mJ0V2ksbA4IsX2vobI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ma Ke , Patrik Jakobsson Subject: [PATCH 6.6 385/568] drm/gma500: fix null pointer dereference in cdv_intel_lvds_get_modes Date: Tue, 30 Jul 2024 17:48:12 +0200 Message-ID: <20240730151654.914141080@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240730151639.792277039@linuxfoundation.org> References: <20240730151639.792277039@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ma Ke commit cb520c3f366c77e8d69e4e2e2781a8ce48d98e79 upstream. In cdv_intel_lvds_get_modes(), the return value of drm_mode_duplicate() is assigned to mode, which will lead to a NULL pointer dereference on failure of drm_mode_duplicate(). Add a check to avoid npd. Cc: stable@vger.kernel.org Fixes: 6a227d5fd6c4 ("gma500: Add support for Cedarview") Signed-off-by: Ma Ke Signed-off-by: Patrik Jakobsson Link: https://patchwork.freedesktop.org/patch/msgid/20240709113311.37168-1-make24@iscas.ac.cn Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/gma500/cdv_intel_lvds.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/gpu/drm/gma500/cdv_intel_lvds.c +++ b/drivers/gpu/drm/gma500/cdv_intel_lvds.c @@ -311,6 +311,9 @@ static int cdv_intel_lvds_get_modes(stru if (mode_dev->panel_fixed_mode != NULL) { struct drm_display_mode *mode = drm_mode_duplicate(dev, mode_dev->panel_fixed_mode); + if (!mode) + return 0; + drm_mode_probed_add(connector, mode); return 1; }