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| author | Nicolin Chen <nicoleotsuka@gmail.com> | 2014-08-04 12:19:48 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-08-04 15:48:41 +0100 |
| commit | 6ccf62c7bea561cca7ffbd50839f883327080800 (patch) | |
| tree | efbedd0abf754e92a07a5c663d5c5bd7d2d571f7 | |
| parent | d387dd08e444b22f844475780fe12a1ad1c6fffd (diff) | |
| download | op-kernel-dev-6ccf62c7bea561cca7ffbd50839f883327080800.zip op-kernel-dev-6ccf62c7bea561cca7ffbd50839f883327080800.tar.gz | |
ASoC: fsl_sarc_dma: Check pair before using it
The patch 3117bb3109dc: "ASoC: fsl_asrc: Add ASRC ASoC CPU DAI and
platform drivers" from Jul 29, 2014, leads to the following Smatch
complaint:
sound/soc/fsl/fsl_asrc_dma.c:304 fsl_asrc_dma_shutdown()
warn: variable dereferenced before check 'pair' (see line 302)
sound/soc/fsl/fsl_asrc_dma.c
301 struct fsl_asrc_pair *pair = runtime->private_data;
302 struct fsl_asrc *asrc_priv = pair->asrc_priv;
^^^^^^^^^^^^^^^
Dereference.
303
304 if (pair && asrc_priv->pair[pair->index] == pair)
^^^^
Check.
305 asrc_priv->pair[pair->index] = NULL;
306
So we just let the driver check pair before using it.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
| -rw-r--r-- | sound/soc/fsl/fsl_asrc_dma.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/sound/soc/fsl/fsl_asrc_dma.c b/sound/soc/fsl/fsl_asrc_dma.c index 5b1e73e..ffc000b 100644 --- a/sound/soc/fsl/fsl_asrc_dma.c +++ b/sound/soc/fsl/fsl_asrc_dma.c @@ -299,9 +299,14 @@ static int fsl_asrc_dma_shutdown(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct fsl_asrc_pair *pair = runtime->private_data; - struct fsl_asrc *asrc_priv = pair->asrc_priv; + struct fsl_asrc *asrc_priv; + + if (!pair) + return 0; + + asrc_priv = pair->asrc_priv; - if (pair && asrc_priv->pair[pair->index] == pair) + if (asrc_priv->pair[pair->index] == pair) asrc_priv->pair[pair->index] = NULL; kfree(pair); |
