2 files changed, 33 insertions, 24 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index afc3fa8b7470..bdc1d74eb7b0 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -2551,8 +2551,9 @@ int snd_soc_info_enum_double(struct snd_kcontrol *kcontrol,
 
         if (uinfo->value.enumerated.item > e->max - 1)
                 uinfo->value.enumerated.item = e->max - 1;
-        strcpy(uinfo->value.enumerated.name,
-                e->texts[uinfo->value.enumerated.item]);
+        strlcpy(uinfo->value.enumerated.name,
+                e->texts[uinfo->value.enumerated.item],
+                sizeof(uinfo->value.enumerated.name));
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_info_enum_double);
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index d4498723b375..591f0f3074c5 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -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 @@ out:
         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)
@@ -1037,6 +1038,12 @@ static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
                 struct snd_pcm_substream *be_substream =
                         snd_soc_dpcm_get_substream(be, stream);
 
+                if (!be_substream) {
+                        dev_err(be->dev, "ASoC: no backend %s stream\n",
+                                stream ? "capture" : "playback");
+                        continue;
+                }
+
                 /* is this op for this BE ? */
                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
                         continue;
@@ -1054,7 +1061,8 @@ static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
                         continue;
 
-                dev_dbg(be->dev, "ASoC: open BE %s\n", be->dai_link->name);
+                dev_dbg(be->dev, "ASoC: open %s BE %s\n",
+                        stream ? "capture" : "playback", be->dai_link->name);
 
                 be_substream->runtime = be->dpcm[stream].runtime;
                 err = soc_pcm_open(be_substream);
@@ -1673,7 +1681,7 @@ 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 +1942,8 @@ 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 +2232,7 @@ 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;
 }