Showing error 741

User: Jiri Slaby
Error type: Invalid Pointer Dereference
Error type description: A pointer which is invalid is being dereferenced
File location: sound/pci/riptide/riptide.c
Line in file: 1641
Project: Linux Kernel
Project version: 2.6.28
Tools: Stanse (1.2)
Smatch (1.59)
Entered: 2011-11-07 22:22:22 UTC

Source: 

1611        struct snd_riptide *chip = snd_pcm_substream_chip(substream);
1612        struct pcmhw *data = get_pcmhwdev(substream);
1613        struct cmdif *cif = chip->cif;
1614
1615        if (cif && data) {
1616                if (data->lbuspath)
1617                        freelbuspath(cif, data->source, data->lbuspath);
1618                data->lbuspath = NULL;
1619                data->source = 0xff;
1620                data->intdec[0] = 0xff;
1621                data->intdec[1] = 0xff;
1622
1623                if (data->sgdlist.area) {
1624                        snd_dma_free_pages(&data->sgdlist);
1625                        data->sgdlist.area = NULL;
1626                }
1627        }
1628        return snd_pcm_lib_free_pages(substream);
1629}
1630
1631static int snd_riptide_playback_open(struct snd_pcm_substream *substream)
1632{
1633        struct snd_riptide *chip = snd_pcm_substream_chip(substream);
1634        struct snd_pcm_runtime *runtime = substream->runtime;
1635        struct pcmhw *data;
1636        int sub_num = substream->number;
1637
1638        chip->playback_substream[sub_num] = substream;
1639        runtime->hw = snd_riptide_playback;
1640        data = kzalloc(sizeof(struct pcmhw), GFP_KERNEL);
1641        data->paths = lbus_play_paths[sub_num];
1642        data->id = play_ids[sub_num];
1643        data->source = play_sources[sub_num];
1644        data->intdec[0] = 0xff;
1645        data->intdec[1] = 0xff;
1646        data->state = ST_STOP;
1647        runtime->private_data = data;
1648        return snd_pcm_hw_constraint_integer(runtime,
1649                                             SNDRV_PCM_HW_PARAM_PERIODS);
1650}
1651
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