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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 40A08FCA19E for ; Mon, 9 Mar 2026 22:44:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=tS7Syzz6CebtVtGlaI2nOBjZZcmCRRpyjNVFrCrYcU0=; b=KB87GtyUJ8KoINoippq0USVlT9 hZe7K6uB36QJ8vA0agOyboH1QqcWD7gGfVFjwJH5sMadwmOaTHCciAn1VagzoiHfw36RKAwzIjd8U IDbKKJM6fNCkWzRf8T8OEM3VF134vsc6gJWHICKZoLsSj5TFu/OIs6yDBGlKgYYT8PyhZidTbOWGU m9GDTyUp280Kdxb6lSornIrDt8QB7JRYCPsBcUYjJNDJiJFTJgHl3XDoe0AWPys3O83ZrBPnIVOk4 41y6bMn0YvY4BaunGS7dYEp0iw2TrqwKJIgKJCKpwxkm0Dg6eGT2RGwYc448j1FC4RTrpPbcwbhlX rOvY5ouQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vzjLJ-00000008FEL-1Wze; Mon, 09 Mar 2026 22:44:53 +0000 Received: from bali.collaboradmins.com ([2a01:4f8:201:9162::2]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vzjL9-00000008F0Y-0XYi; Mon, 09 Mar 2026 22:44:44 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1773096281; bh=G0L1ZFdJ8ipmt4Cudovn7XKwjKaSlysZ1PuC86cYCI0=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=omj7jF6uFnTcbRu1si/OQtMQudraGEkTfgicmtwrBTIcIk91vZ9o2rPp7+dhtIMhh jhYexQp1MkrWyaTi1zd6iNXne+OJIr+1g8jAqhYb7QvfTbgXWdIUu2Ga+JGXVUjsjs vNChTJf/KeQ7O+oSrAeLbmH+PBVgyBKCuE9mYFYyUv1R9rwBlniF6wZTIuwMM9XnAY NvhCsfp7TQ0YwpObix5nkJbA46RrFGdywvgHNHUiAmDNR6FwiHl8fu5XA8FQRol1ob 9btMxmtl6ZKDFyRncU+k2pRiDoXeQVLEiWgm42TuAR1RSSmI1oNAIOuW8YZqPZvkEO nrv95qDQ4Um+Q== Received: from localhost (unknown [86.123.23.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: cristicc) by bali.collaboradmins.com (Postfix) with ESMTPSA id D282117E13CB; Mon, 9 Mar 2026 23:44:40 +0100 (CET) From: Cristian Ciocaltea Date: Tue, 10 Mar 2026 00:44:35 +0200 Subject: [PATCH v2 7/8] drm/bridge: synopsys: dw-dp: Unregister AUX channel on bridge detach MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260310-drm-rk-fixes-v2-7-645ecfb43f49@collabora.com> References: <20260310-drm-rk-fixes-v2-0-645ecfb43f49@collabora.com> In-Reply-To: <20260310-drm-rk-fixes-v2-0-645ecfb43f49@collabora.com> To: Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Andy Yan , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Dmitry Baryshkov , Dmitry Baryshkov , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec Cc: kernel@collabora.com, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.14.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260309_154443_415486_B945F37A X-CRM114-Status: GOOD ( 10.13 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The DisplayPort AUX channel gets initialized and registered during dw_dp_bind(), but it is never unregistered, which may lead to resource leaks and/or use-after-free: [ 224.661371] BUG: KASAN: slab-use-after-free in device_is_dependent+0xe0/0x2b0 [ 224.662015] Read of size 8 at addr ffff00011aee8550 by task modprobe/658 ... [ 224.662796] device_is_dependent+0xe0/0x2b0 [ 224.662802] device_is_dependent+0x108/0x2b0 [ 224.662808] device_link_add+0x1f8/0x10b0 [ 224.662813] devm_of_phy_get_by_index+0x120/0x200 [ 224.662819] dw_dp_bind+0x34c/0xb10 [dw_dp] [ 224.662830] dw_dp_rockchip_bind+0x194/0x250 [rockchipdrm] [ 224.662864] component_bind_all+0x3a8/0x720 [ 224.662869] rockchip_drm_bind+0x120/0x390 [rockchipdrm] [ 224.662899] try_to_bring_up_aggregate_device+0x76c/0x838 [ 224.662904] component_master_add_with_match+0x1f4/0x230 [ 224.662909] rockchip_drm_platform_probe+0x420/0x538 [rockchipdrm] [ 224.662939] platform_probe+0xe8/0x168 [ 224.662945] really_probe+0x340/0x828 [ 224.662950] __driver_probe_device+0x2e0/0x350 [ 224.662954] driver_probe_device+0x80/0x140 [ 224.662959] __driver_attach+0x398/0x460 [ 224.662964] bus_for_each_dev+0xe0/0x198 [ 224.662968] driver_attach+0x50/0x68 [ 224.662972] bus_add_driver+0x2a0/0x4c0 [ 224.662977] driver_register+0x294/0x360 [ 224.662982] __platform_driver_register+0x7c/0x98 [ 224.662987] rockchip_drm_init+0xc4/0xff8 [rockchipdrm] ... Unregister the AUX adapter on bridge detach. Fixes: 86eecc3a9c2e ("drm/bridge: synopsys: Add DW DPTX Controller support library") Signed-off-by: Cristian Ciocaltea --- drivers/gpu/drm/bridge/synopsys/dw-dp.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-dp.c b/drivers/gpu/drm/bridge/synopsys/dw-dp.c index e7bef9150f6a..8d02f047693a 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-dp.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-dp.c @@ -1751,6 +1751,13 @@ static const struct drm_edid *dw_dp_bridge_edid_read(struct drm_bridge *bridge, return edid; } +static void dw_dp_bridge_detach(struct drm_bridge *bridge) +{ + struct dw_dp *dp = bridge_to_dp(bridge); + + drm_dp_aux_unregister(&dp->aux); +} + static u32 *dw_dp_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, struct drm_bridge_state *bridge_state, struct drm_crtc_state *crtc_state, @@ -1824,6 +1831,7 @@ static const struct drm_bridge_funcs dw_dp_bridge_funcs = { .atomic_disable = dw_dp_bridge_atomic_disable, .detect = dw_dp_bridge_detect, .edid_read = dw_dp_bridge_edid_read, + .detach = dw_dp_bridge_detach, }; static int dw_dp_link_retrain(struct dw_dp *dp) -- 2.52.0