[alsa-devel] [PATCH][ASoC V2] Fix null-pointer dereference in soc_create_pcm()

Mark Brown broonie at opensource.wolfsonmicro.com
Wed May 21 12:54:26 CEST 2008

On Wed, May 21, 2008 at 12:36:40PM +0200, Takashi Iwai wrote:
> Mark Brown wrote:

> > > When soc_create_pcm() finds all four components it needs, it displays a status
> > > message.  This message references the local variables 'codec_dai' and

> This looks applicable to the upstream tree... Shouldn't it be fixed as
> well?

The error condition can't occur in ASoC v1 - it doesn't support the
dynamic registration of machine components so the local codec and CPU
DAI variables must always have been initialised if soc_new_pcm()
succeeds.  It's an issue for v2 because soc_create_pcm() can be called
multiple times if the PCM is registered before all the components
required to create it are registered - if that happens then only the
last component to be added will have had the local variables

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