From nobody Mon Jun 15 00:20:15 2026 Received: from cstnet.cn (smtp25.cstnet.cn [159.226.251.25]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5D1E033030F; Thu, 9 Apr 2026 08:48:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.25 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775724518; cv=none; b=uu7jdmjkvnML8bV5K/GR3WP2CKaQTXGIg3UUvUbk4BQPJeu0w33dxrx1vJNSf2BJuQfBRo3BWVgRF6R/gm6+fHu3PuiKH4a62ZLW/mrr7Z8DFbgRMozyT+2+ahnvTr8k2JcxS/SLIRg8GCvZp7e6bqMrgLtMqrw3t4oZOkGmZ/g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775724518; c=relaxed/simple; bh=5S/5OtkxkkJObcqL9GnYv2tKi9bnZ7uu0Eiwsn4oiAo=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=g+a94cUSMN/EznrExvm/YZX2MM1bleY8MPZxwXhLOT0Qart5YvGYfByI3YZVFtiA74xmD96nhf1j812/Zmb5ueesK657kdRKBuqTY9VeLMcjb4jlcCxX9YH235cPZdfy5143bSuvjqukkL+AFBpFb5ElO7tXZBKjyBgTSM1Uun0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.25 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from dfae2b116770.home.arpa (unknown [124.16.138.129]) by APP-05 (Coremail) with SMTP id zQCowADHWQ3SZ9dpAeYJDQ--.43265S2; Thu, 09 Apr 2026 16:48:18 +0800 (CST) From: Wentao Liang To: andrzej.hajda@intel.com, neil.armstrong@linaro.org, rfoss@kernel.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch Cc: Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se, jernej.skrabec@gmail.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Wentao Liang , stable@vger.kernel.org Subject: [PATCH] drm/bridge: it6505: fix use-after-free in it6505_parse_dt() Date: Thu, 9 Apr 2026 08:48:17 +0000 Message-Id: <20260409084817.470401-1-vulab@iscas.ac.cn> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: zQCowADHWQ3SZ9dpAeYJDQ--.43265S2 X-Coremail-Antispam: 1UD129KBjvJXoW7ZryfGFW8tw4fGw4UZF4Utwb_yoW8Xr45pr sIqa1Yvr9rZa9xKay8AryxtF9aya1DXFWrCF9rCw4avwn8X3WUAFW7CrZxXFy8uF1rZw1a yr4vkF9Fgr1Ykr7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUU9K14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26F1j6w1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26F4j 6r4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oV Cq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0 I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r 4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628v n2kIc2xKxwCY1x0262kKe7AKxVWUtVW8ZwCY02Avz4vE14v_GFyl42xK82IYc2Ij64vIr4 1l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK 67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI 8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAv wI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14 v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjfUe9NVDUUUU X-CM-SenderInfo: pyxotu46lvutnvoduhdfq/1tbiBgoMA2nXPWqtFQAAsS Content-Type: text/plain; charset="utf-8" In it6505_parse_dt(), of_node_put(ep) is called prematurely before the last access to ep when reading the "link-frequencies" property, leading to a use-after-free if the node's reference count drops to zero. Move the of_node_put() calls after the last use of ep in both the success and error paths. Fixes: 380d920b582d ("drm/bridge: add it6505 driver to read data-lanes and = link-frequencies from dt") Cc: stable@vger.kernel.org Signed-off-by: Wentao Liang --- drivers/gpu/drm/bridge/ite-it6505.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/i= te-it6505.c index a094803ba7aa..4155b5e67c2d 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -3361,13 +3361,13 @@ static void it6505_parse_dt(struct it6505 *it6505) } =20 ep =3D of_graph_get_endpoint_by_regs(np, 0, 0); - of_node_put(ep); =20 if (ep) { len =3D of_property_read_variable_u64_array(ep, "link-frequencies", &link_frequencies, 0, 1); + of_node_put(ep); if (len >=3D 0) { do_div(link_frequencies, 1000); if (link_frequencies > 297000) { @@ -3382,6 +3382,7 @@ static void it6505_parse_dt(struct it6505 *it6505) *max_dpi_pixel_clock =3D DPI_PIXEL_CLK_MAX; } } else { + of_node_put(ep); dev_err(dev, "error endpoint, use default"); *max_dpi_pixel_clock =3D DPI_PIXEL_CLK_MAX; } --=20 2.34.1