linux-kernel - [PATCH 5.16 0966/1017] ASoC: soc-compress: Change the check for codec

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Date:   Tue,  5 Apr 2022 09:31:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 5.16 0966/1017] ASoC: soc-compress: Change the check for codec_dai

From: Jiasheng Jiang <jiasheng@...as.ac.cn>

commit ccb4214f7f2a8b75acf493f31128e464ee1a3536 upstream.

It should be better to reverse the check on codec_dai
and returned early in order to be easier to understand.

Fixes: de2c6f98817f ("ASoC: soc-compress: prevent the potentially use of null pointer")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
Reviewed-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
Link: https://lore.kernel.org/r/20220310030041.1556323-1-jiasheng@iscas.ac.cn
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/soc/soc-compress.c |   19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

--- a/sound/soc/soc-compress.c
+++ b/sound/soc/soc-compress.c
@@ -567,16 +567,19 @@ int snd_soc_new_compress(struct snd_soc_
 		return -EINVAL;
 	}
 
-	/* check client and interface hw capabilities */
-	if (codec_dai) {
-		if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
-		    snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_PLAYBACK))
-			playback = 1;
-		if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
-		    snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_CAPTURE))
-			capture = 1;
+	if (!codec_dai) {
+		dev_err(rtd->card->dev, "Missing codec\n");
+		return -EINVAL;
 	}
 
+	/* check client and interface hw capabilities */
+	if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
+	    snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_PLAYBACK))
+		playback = 1;
+	if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
+	    snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_CAPTURE))
+		capture = 1;
+
 	/*
 	 * Compress devices are unidirectional so only one of the directions
 	 * should be set, check for that (xor)