linux-kernel - [PATCH AUTOSEL 4.19 02/38] ASoC: img: Fix a reference count leak in img_i2s_in_set

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Message-Id: <20200821161807.348600-2-sashal@kernel.org>
Date:   Fri, 21 Aug 2020 12:17:31 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Qiushi Wu <wu000273@....edu>, Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>, alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 4.19 02/38] ASoC: img: Fix a reference count leak in img_i2s_in_set_fmt

From: Qiushi Wu <wu000273@....edu>

[ Upstream commit c4c59b95b7f7d4cef5071b151be2dadb33f3287b ]

pm_runtime_get_sync() increments the runtime PM usage counter even
when it returns an error code, causing incorrect ref count if
pm_runtime_put_noidle() is not called in error handling paths.
Thus call pm_runtime_put_noidle() if pm_runtime_get_sync() fails.

Signed-off-by: Qiushi Wu <wu000273@....edu>
Link: https://lore.kernel.org/r/20200614033749.2975-1-wu000273@umn.edu
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/img/img-i2s-in.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/soc/img/img-i2s-in.c b/sound/soc/img/img-i2s-in.c
index c22880aea82a2..7e48c740bf550 100644
--- a/sound/soc/img/img-i2s-in.c
+++ b/sound/soc/img/img-i2s-in.c
@@ -346,8 +346,10 @@ static int img_i2s_in_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 	chan_control_mask = IMG_I2S_IN_CH_CTL_CLK_TRANS_MASK;
 
 	ret = pm_runtime_get_sync(i2s->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(i2s->dev);
 		return ret;
+	}
 
 	for (i = 0; i < i2s->active_channels; i++)
 		img_i2s_in_ch_disable(i2s, i);
-- 
2.25.1