[PATCH 4/4] ASoC: audio-graph-card: fix an use-after-free in graph_get_dai_id()

[Wen Yang]

After calling of_node_put() on the node variable, it is still being
used, which may result in use-after-free.
Fix this issue by calling of_node_put() after the last usage.

Fixes: a0c426fe1433 ("ASoC: simple-card-utils: check "reg" property on 
asoc_simple_card_get_dai_id()")
Signed-off-by: Wen Yang <wen.yan...@zte.com.cn>
Cc: Liam Girdwood <lgirdw...@gmail.com>
Cc: Mark Brown <broo...@kernel.org>
Cc: Jaroslav Kysela <pe...@perex.cz>
Cc: Takashi Iwai <ti...@suse.com>
Cc: Kuninori Morimoto <kuninori.morimoto...@renesas.com>
Cc: alsa-de...@alsa-project.org
Cc: linux-kernel@vger.kernel.org
---
 sound/soc/generic/audio-graph-card.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/soc/generic/audio-graph-card.c 
b/sound/soc/generic/audio-graph-card.c
index 31fc83d..c8abb86 100644
--- a/sound/soc/generic/audio-graph-card.c
+++ b/sound/soc/generic/audio-graph-card.c
@@ -63,6 +63,7 @@ static int graph_get_dai_id(struct device_node *ep)
        struct device_node *endpoint;
        struct of_endpoint info;
        int i, id;
+       u32 *reg;
        int ret;
 
        /* use driver specified DAI ID if exist */
@@ -83,8 +84,9 @@ static int graph_get_dai_id(struct device_node *ep)
                        return info.id;
 
                node = of_get_parent(ep);
+               reg = of_get_property(node, "reg", NULL);
                of_node_put(node);
-               if (of_get_property(node, "reg", NULL))
+               if (reg)
                        return info.port;
        }
        node = of_graph_get_port_parent(ep);
-- 
2.9.5