From nobody Fri Sep 25 01:22:24 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 7140049D583; Thu, 17 Sep 2026 16:58:58 +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=1789664342; cv=none; b=lcJQCNvL9OFplIaApEtFNvzU73m5gNvffFmse5gejzt9lD1dz7Ubrxe7nhRaN4kF6VUYkD1MaKm0NmViKBxmMD0KP/NXWGwhf/iwudkDIeJx3bOgsTKNu5d9k7eKbE01F8Cjs41lzx4XgkiImWRchOkpDCRvl6bk0C6Ug7k1JiE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789664342; c=relaxed/simple; bh=MycG3yYr3m3hyQ3sKhvgTVcsHY/rCjgmG4aI/ttkpOU=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=tp8asiNaYQAtJiDCGUoE3VreFej5Lrn5FwomBfPFxnAoD2uZz4MFRf/qwaGHUR2MSLM8Vgud4qbIk3wYm2ksi6o3Ko4D4lLbAfUrXBOdpU6lQDPzcVbntL7CGHvlbfubyJzABbSfB4/JLTaTYTBElwIt3ZrBhFV1irHSJSY9Dts= 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 [36.110.52.2]) by APP-05 (Coremail) with SMTP id zQCowADH+EJLHKxqMO+ECA--.48164S2; Fri, 18 Sep 2026 00:58:51 +0800 (CST) From: Wentao Liang To: broonie@kernel.org Cc: kuninori.morimoto.gx@renesas.com, lgirdwood@gmail.com, linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org, perex@perex.cz, tiwai@suse.com, Wentao Liang , stable@vger.kernel.org Subject: [PATCH] ASoC: audio-graph-card2: Fix use-after-free in audio_graph2_link_c2c() Date: Thu, 17 Sep 2026 16:58:51 +0000 Message-Id: <20260917165851.2163548-1-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: zQCowADH+EJLHKxqMO+ECA--.48164S2 X-Coremail-Antispam: 1UD129KBjvJXoW7CrWkJryrGw4fur15XryrWFg_yoW8GF4kp3 Z5KFZ8JrWDWw4UuF40vrykJrZ0yanrC3yrGF1UJ3yqkanxt3yfZa4UZrn5uF4YkFs5uFWk JryDtas7Jws8AaDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUvC1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s1l1IIY67AE w4v_Jr0_Jr4l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2 IY67AKxVW8JVW5JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1l84ACjcxK6I8E 87Iv67AKxVWxJVW8Jr1l84ACjcxK6I8E87Iv6xkF7I0E14v26r4UJVWxJr1le2I262IYc4 CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E2Ix0cI8IcVAFwI0_ Jw0_WrylYx0Ex4A2jsIE14v26r4j6F4UMcvjeVCFs4IE7xkEbVWUJVW8JwACjcxG0xvY0x 0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lc7CjxVAaw2AFwI0_Jw0_GFyl42xK82IY c2Ij64vIr41l42xK82IY6x8ErcxFaVAv8VW8GFyrJr1UJwCFx2IqxVCFs4IE7xkEbVWUJV W8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF 1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUCVW8JwCI42IY6x IIjxv20xvEc7CjxVAFwI0_Cr0_Gr1UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY 6I8E87Iv67AKxVW8JVWxJwCI42IY6I8E87Iv6xkF7I0E14v26r4UJVWxJrUvcSsGvfC2Kf nxnUUI43ZEXa7VUbUPEDUUUUU== X-CM-SenderInfo: pyxotu46lvutnvoduhdfq/1tbiCRUNA2qr9LZdKAAAsk Content-Type: text/plain; charset="utf-8" of_graph_get_next_port() consumes the reference of its prev argument. port0 is only borrowed from the caller's iterator, so the call drops a reference the function does not own, and port0 is dereferenced again afterwards. Pass an extra reference, as graph_count_c2c() does, so the reference the callee consumes is the one taken here. Fixes: 5f281c3e82b1 ("ASoC: audio-graph-card2: use __free(device_node) for = device node") Cc: stable@vger.kernel.org Signed-off-by: Wentao Liang Acked-by: Kuninori Morimoto --- sound/soc/generic/audio-graph-card2.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/sound/soc/generic/audio-graph-card2.c b/sound/soc/generic/audi= o-graph-card2.c index 0202ed0ee78e..268023d6f939 100644 --- a/sound/soc/generic/audio-graph-card2.c +++ b/sound/soc/generic/audio-graph-card2.c @@ -969,7 +969,8 @@ int audio_graph2_link_c2c(struct simple_util_priv *priv, struct snd_soc_dai_link *dai_link =3D simple_priv_to_link(priv, li->link); struct device_node *port0 =3D lnk; struct device_node *ports __free(device_node) =3D port_to_ports(port0); - struct device_node *port1 __free(device_node) =3D of_graph_get_next_port(= ports, port0); + struct device_node *port1 __free(device_node) =3D + of_graph_get_next_port(ports, of_node_get(port0)); u32 val =3D 0; int ret =3D -EINVAL; =20 --=20 2.34.1