From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wen Yang Subject: [PATCH 2/4] ASoC: simple-card: fix an use-after-free in simple_for_each_link() Date: Wed, 10 Jul 2019 15:25:07 +0800 Message-ID: <1562743509-30496-3-git-send-email-wen.yang99@zte.com.cn> References: <1562743509-30496-1-git-send-email-wen.yang99@zte.com.cn> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mxhk.zte.com.cn (mxhk.zte.com.cn [63.217.80.70]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 421B5F802A0 for ; Wed, 10 Jul 2019 09:29:13 +0200 (CEST) In-Reply-To: <1562743509-30496-1-git-send-email-wen.yang99@zte.com.cn> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" To: lgirdwood@gmail.com Cc: jonathanh@nvidia.com, wang.yi59@zte.com.cn, alsa-devel@alsa-project.org, kuninori.morimoto.gx@renesas.com, linux-kernel@vger.kernel.org, tiwai@suse.com, broonie@kernel.org, xue.zhihong@zte.com.cn, cheng.shengyu@zte.com.cn, Wen Yang List-Id: alsa-devel@alsa-project.org The codec variable is still being used after the of_node_put() call, which may result in use-after-free. Fixes: d947cdfd4be2 ("ASoC: simple-card: cleanup DAI link loop method - step1") Signed-off-by: Wen Yang Cc: Liam Girdwood Cc: Mark Brown Cc: Jaroslav Kysela Cc: Takashi Iwai Cc: Kuninori Morimoto Cc: Jon Hunter Cc: alsa-devel@alsa-project.org Cc: linux-kernel@vger.kernel.org --- sound/soc/generic/simple-card.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c index 4117e54..ef84915 100644 --- a/sound/soc/generic/simple-card.c +++ b/sound/soc/generic/simple-card.c @@ -364,8 +364,6 @@ static int simple_for_each_link(struct asoc_simple_priv *priv, goto error; } - of_node_put(codec); - /* get convert-xxx property */ memset(&adata, 0, sizeof(adata)); for_each_child_of_node(node, np) @@ -387,11 +385,13 @@ static int simple_for_each_link(struct asoc_simple_priv *priv, ret = func_noml(priv, np, codec, li, is_top); if (ret < 0) { + of_node_put(codec); of_node_put(np); goto error; } } + of_node_put(codec); node = of_get_next_child(top, node); } while (!is_top && node); -- 2.9.5