[PATCH 5.17 0401/1126] ASoC: atmel: Fix error handling in snd_proto_probe

Greg Kroah-Hartman
2022-04-05T08:20:58Z

From: Miaoqian Lin <linmq006@gmail.com>

[ Upstream commit b0bfaf0544d08d093d6211d7ef8816fb0b5b6c75 ]

The device_node pointer is returned by of_parse_phandle() with refcount
incremented. We should use of_node_put() on it when done.

This function only calls of_node_put() in the regular path.
And it will cause refcount leak in error paths.
Fix this by calling of_node_put() in error handling too.

Fixes: a45f8853a5f9 ("ASoC: Add driver for PROTO Audio CODEC (with a WM8731)")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Reviewed-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Link: https://lore.kernel.org/r/20220308013949.20323-1-linmq006@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/atmel/mikroe-proto.c | 20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/sound/soc/atmel/mikroe-proto.c b/sound/soc/atmel/mikroe-proto.c
index 627564c18c27..ce46d8a0b7e4 100644
--- a/sound/soc/atmel/mikroe-proto.c
+++ b/sound/soc/atmel/mikroe-proto.c
@@ -115,7 +115,8 @@ static int snd_proto_probe(struct platform_device *pdev)
cpu_np = of_parse_phandle(np, "i2s-controller", 0);
if (!cpu_np) {
dev_err(&pdev->dev, "i2s-controller missing\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto put_codec_node;
}
dai->cpus->of_node = cpu_np;
dai->platforms->of_node = cpu_np;
@@ -125,7 +126,8 @@ static int snd_proto_probe(struct platform_device *pdev)
&bitclkmaster, &framemaster);
if (bitclkmaster != framemaster) {
dev_err(&pdev->dev, "Must be the same bitclock and frame master\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto put_cpu_node;
}
if (bitclkmaster) {
if (codec_np == bitclkmaster)
@@ -136,18 +138,20 @@ static int snd_proto_probe(struct platform_device *pdev)
dai_fmt |= snd_soc_daifmt_parse_clock_provider_as_flag(np, NULL);
}

- of_node_put(bitclkmaster);
- of_node_put(framemaster);
- dai->dai_fmt = dai_fmt;
-
- of_node_put(codec_np);
- of_node_put(cpu_np);

+ dai->dai_fmt = dai_fmt;
ret = snd_soc_register_card(&snd_proto);
if (ret)
dev_err_probe(&pdev->dev, ret,
"snd_soc_register_card() failed\n");

+
+put_cpu_node:
+ of_node_put(bitclkmaster);
+ of_node_put(framemaster);
+ of_node_put(cpu_np);
+put_codec_node:
+ of_node_put(codec_np);
return ret;
}

--
2.34.1