From: Wen Yang wen.yang99@zte.com.cn
[ Upstream commit c152f8491a8d9a4b25afd65a86eb5e55e2a8c380 ]
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()") Link: https://lore.kernel.org/r/1562743509-30496-5-git-send-email-wen.yang99@zte.c... Signed-off-by: Wen Yang wen.yang99@zte.com.cn Acked-by: Kuninori Morimoto kuninori.morimoto.gx@renesas.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@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 d5188a179378f..a681ea443fc16 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);