From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pidgin.makrotopia.org (pidgin.makrotopia.org [185.142.180.65]) (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 27E6E4AC17E for ; Thu, 24 Sep 2026 18:42:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.142.180.65 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790275340; cv=none; b=VfkaLVuAl32tEx54Vu2fxI0nO6W/Q9msHXnJO9lf3r+r/RnS70E7DysfhppJ6fQbCN/z7UjVPR4el744KPXMQ5RB6bZwfo4nahMAEa3A/NHkV4zpWMK3XO1NBu0uJVWENByBXyQxoEXwuTz9PWWjKC9W3WWHSkoSrC5nMUfndOY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790275340; c=relaxed/simple; bh=Wbd6iqfMtTrszaYeXnHYw3hdjlgXyFEGWue0+CMslZU=; h=Date:From:To:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=myw3AP/YYRjKBKFtV8jZ9oFWLR73dq9J005ThVIEuurmuO+s8mIkZYtY7gBupdFdWqviNpz5By8m55q0rutmn/PwbYvXGmlixQd+PKhZ5VH+RD23/8sXDLd4Mm9gMRiSsMvOI1wkXRWztizyJMt+QscE+BqQfJgXlsmEZhgMZ1I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=makrotopia.org; spf=pass smtp.mailfrom=makrotopia.org; arc=none smtp.client-ip=185.142.180.65 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=makrotopia.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=makrotopia.org Received: from local by pidgin.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256:X25519MLKEM768) (Exim 4.100) (envelope-from ) id 1x9oOW-000000007QN-33Tw; Thu, 24 Sep 2026 18:42:08 +0000 Date: Thu, 24 Sep 2026 19:42:05 +0100 From: Daniel Golle To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Matthias Brugger , AngeloGioacchino Del Regno , Allen Chen , Hermes Wu , Pin-yen Lin , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: [PATCH v7 11/14] drm/bridge: it6505: reject a too short link-frequencies property Message-ID: <96a53555019f573ddc95ab15434a7ca09e19a12b.1790275151.git.daniel@makrotopia.org> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: of_property_read_variable_u64_array() is asked for a minimum array size of zero, so a link-frequencies property shorter than one u64 -- a 32-bit value written by mistake, say -- returns 0 without storing anything. it6505_parse_dt() reads that as success and derives max_dpi_pixel_clock from an uninitialised stack variable. Ask for one element so a short property lands in the existing error path. Fixes: 380d920b582d ("drm/bridge: add it6505 driver to read data-lanes and link-frequencies from dt") Signed-off-by: Daniel Golle --- v7: no changes v6: new patch --- drivers/gpu/drm/bridge/ite-it6505.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c index dbef1a1bc5e3..d6ba28d1c963 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -3392,7 +3392,7 @@ static void it6505_parse_dt(struct it6505 *it6505) if (ep) { len = of_property_read_variable_u64_array(ep, "link-frequencies", - &link_frequencies, 0, + &link_frequencies, 1, 1); if (len >= 0) { do_div(link_frequencies, 1000); -- 2.55.0