Hi Tomasz
What I based my patch on is really because of this line:
if (substream)
snd_pcm_period_elapsed(substream);
Boojin Kim thought that this was needed, if this is true anymore..? I
have not been able to immerse myself so much in all patches.
I'm working on about 100 similar patches.
344b4c48 sound/soc/samsung/dma.c (Boojin Kim 2011-09-02
09:44:43 +0900 123) prtd->dma_pos += prtd->dma_period;
344b4c48 sound/soc/samsung/dma.c (Boojin Kim 2011-09-02
09:44:43 +0900 124) if (prtd->dma_pos >= prtd->dma_end)
344b4c48 sound/soc/samsung/dma.c (Boojin Kim 2011-09-02
09:44:43 +0900 125) prtd->dma_pos =
prtd->dma_start;
5111c075 sound/soc/s3c24xx/s3c24xx-pcm.c (Mark Brown 2008-04-30
17:19:32 +0200 126)
344b4c48 sound/soc/samsung/dma.c (Boojin Kim 2011-09-02
09:44:43 +0900 127) if (substream)
344b4c48 sound/soc/samsung/dma.c (Boojin Kim 2011-09-02
09:44:43 +0900 128)
snd_pcm_period_elapsed(substream);
c0f41bb1 sound/soc/s3c24xx/s3c24xx-pcm.c (Ben Dooks 2007-02-14
13:20:03 +0100 129)
344b4c48 sound/soc/samsung/dma.c (Boojin Kim 2011-09-02
09:44:43 +0900 130) spin_lock(&prtd->lock);
Best regards
Rickard Strandqvist
2014-05-19 12:52 GMT+02:00 Tomasz Figa <tomasz.figa@xxxxxxxxx>:
> Hi Rickard,
>
> On 15.05.2014 23:57, Rickard Strandqvist wrote:
>> There is otherwise a risk of a possible null pointer dereference.
>>
>> Was largely found by using a static code analysis program called cppcheck.
>>
>> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@xxxxxxxxxxxxxxxxxx>
>> ---
>> sound/soc/samsung/dma.c | 10 ++++++----
>> 1 fil ändrad, 6 tillägg(+), 4 borttagningar(-)
>>
>> diff --git a/sound/soc/samsung/dma.c b/sound/soc/samsung/dma.c
>> index dc09b71..b1f6757 100644
>> --- a/sound/soc/samsung/dma.c
>> +++ b/sound/soc/samsung/dma.c
>> @@ -115,17 +115,19 @@ static void dma_enqueue(struct snd_pcm_substream *substream)
>> static void audio_buffdone(void *data)
>> {
>> struct snd_pcm_substream *substream = data;
>> - struct runtime_data *prtd = substream->runtime->private_data;
>> + struct runtime_data *prtd = NULL;
>>
>> pr_debug("Entered %s\n", __func__);
>>
>> - if (prtd->state & ST_RUNNING) {
>> + if(substream)
>> + prtd = substream->runtime->private_data;
>> +
>> + if (prtd && prtd->state & ST_RUNNING) {
>> prtd->dma_pos += prtd->dma_period;
>> if (prtd->dma_pos >= prtd->dma_end)
>> prtd->dma_pos = prtd->dma_start;
>>
>> - if (substream)
>> - snd_pcm_period_elapsed(substream);
>> + snd_pcm_period_elapsed(substream);
>>
>> spin_lock(&prtd->lock);
>> if (!samsung_dma_has_circular()) {
>>
>
> Can you find a path (or use case, if possible) on which any of affected
> pointers will be NULL?
>
> Best regards,
> Tomasz
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