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ASoC: pcm: Check for ops before deferencing them 

Ensure that we always check that an ops structure is present before we
try to use it, improving the robustness of the system.

Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Mark Brown 2013-10-30 17:47:39 -07:00
parent a19685cb72
commit c5914b0aae
1 changed files with 22 additions and 21 deletions
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43
sound/soc/soc-pcm.c
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@ -190,7 +190,7 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
/* startup the audio subsystem */
if (cpu_dai->driver->ops->startup) {
if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
if (ret < 0) {
dev_err(cpu_dai->dev, "ASoC: can't open interface"
@ -208,7 +208,7 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
}
}
if (codec_dai->driver->ops->startup) {
if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
ret = codec_dai->driver->ops->startup(substream, codec_dai);
if (ret < 0) {
dev_err(codec_dai->dev, "ASoC: can't open codec"
@ -463,7 +463,7 @@ static int soc_pcm_prepare(struct snd_pcm_substream *substream)
}
}
if (codec_dai->driver->ops->prepare) {
if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
ret = codec_dai->driver->ops->prepare(substream, codec_dai);
if (ret < 0) {
dev_err(codec_dai->dev, "ASoC: DAI prepare error: %d\n",
@ -472,7 +472,7 @@ static int soc_pcm_prepare(struct snd_pcm_substream *substream)
}
}
if (cpu_dai->driver->ops->prepare) {
if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
if (ret < 0) {
dev_err(cpu_dai->dev, "ASoC: DAI prepare error: %d\n",
@ -523,7 +523,7 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
}
}
if (codec_dai->driver->ops->hw_params) {
if (codec_dai->driver->ops && codec_dai->driver->ops->hw_params) {
ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
if (ret < 0) {
dev_err(codec_dai->dev, "ASoC: can't set %s hw params:"
@ -532,7 +532,7 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
}
}
if (cpu_dai->driver->ops->hw_params) {
if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_params) {
ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
if (ret < 0) {
dev_err(cpu_dai->dev, "ASoC: %s hw params failed: %d\n",
@ -559,11 +559,11 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
return ret;
platform_err:
if (cpu_dai->driver->ops->hw_free)
if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
cpu_dai->driver->ops->hw_free(substream, cpu_dai);
interface_err:
if (codec_dai->driver->ops->hw_free)
if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
codec_dai->driver->ops->hw_free(substream, codec_dai);
codec_err:
@ -600,10 +600,10 @@ static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
platform->driver->ops->hw_free(substream);
/* now free hw params for the DAIs */
if (codec_dai->driver->ops->hw_free)
if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
codec_dai->driver->ops->hw_free(substream, codec_dai);
if (cpu_dai->driver->ops->hw_free)
if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
cpu_dai->driver->ops->hw_free(substream, cpu_dai);
mutex_unlock(&rtd->pcm_mutex);
@ -618,7 +618,7 @@ static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
struct snd_soc_dai *codec_dai = rtd->codec_dai;
int ret;
if (codec_dai->driver->ops->trigger) {
if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
if (ret < 0)
return ret;
@ -630,7 +630,7 @@ static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
return ret;
}
if (cpu_dai->driver->ops->trigger) {
if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
if (ret < 0)
return ret;
@ -647,19 +647,20 @@ static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
struct snd_soc_dai *codec_dai = rtd->codec_dai;
int ret;
if (codec_dai->driver->ops->bespoke_trigger) {
if (codec_dai->driver->ops &&
codec_dai->driver->ops->bespoke_trigger) {
ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
if (ret < 0)
return ret;
}
if (platform->driver->bespoke_trigger) {
if (platform->driver->ops && platform->driver->bespoke_trigger) {
ret = platform->driver->bespoke_trigger(substream, cmd);
if (ret < 0)
return ret;
}
if (cpu_dai->driver->ops->bespoke_trigger) {
if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
if (ret < 0)
return ret;
@ -684,10 +685,10 @@ static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
if (platform->driver->ops && platform->driver->ops->pointer)
offset = platform->driver->ops->pointer(substream);
if (cpu_dai->driver->ops->delay)
if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
if (codec_dai->driver->ops->delay)
if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
delay += codec_dai->driver->ops->delay(substream, codec_dai);
if (platform->driver->delay)
@ -1673,7 +1674,7 @@ static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_platform *platform = rtd->platform;
if (platform->driver->ops->ioctl)
if (platform->driver->ops && platform->driver->ops->ioctl)
return platform->driver->ops->ioctl(substream, cmd, arg);
return snd_pcm_lib_ioctl(substream, cmd, arg);
}
@ -1934,8 +1935,8 @@ int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
dev_dbg(be->dev, "ASoC: BE digital mute %s\n", be->dai_link->name);
if (drv->ops->digital_mute && dai->playback_active)
drv->ops->digital_mute(dai, mute);
if (drv->ops && drv->ops->digital_mute && dai->playback_active)
drv->ops->digital_mute(dai, mute);
}
return 0;
@ -2224,7 +2225,7 @@ EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_platform *platform)
{
if (platform->driver->ops->trigger)
if (platform->driver->ops && platform->driver->ops->trigger)
return platform->driver->ops->trigger(substream, cmd);
return 0;
}