[alsa-devel] Question on compress offload framework memory corruption

Vinod Koul vinod.koul at intel.com
Sun Jan 5 15:04:38 CET 2014

On Thu, Dec 19, 2013 at 10:55:08AM +0000, Mark Brown wrote:
> On Wed, Dec 18, 2013 at 01:17:51PM -0000, gsantosh at codeaurora.org wrote:
> > Hi,
> > 
> > I have following questions in the compressed offload framework API.
> > 
> > static int soc_compr_set_params_fe(struct snd_compr_stream *cstream,
> > 					struct snd_compr_params *params)
> > {
> > ...
> > 	hw_params = kzalloc(sizeof(*hw_params), GFP_KERNEL);
> > 	if (hw_params == NULL)
> > 		return -ENOMEM;
> > /*1st question is, what is the use of above allocated memory I do not see
> > this being used in this function*/
> The code you're quoting there isn't in mainline.  I've also added Vinod
> to the CCs, you probably want to include him in any discussion of the
> compressed API.
That's right, this is from DPCM compressed updated done by Liam, so he is the
best person to comment on this bit, and somehow his address in CC has gone bad,
i have added him in to list

But yes looking at the source, i agree that two are interlinked.
I guess we need to poupulate the hw_params and then use that to copy, that would
be the right thing to do here and yes this is not correct and not sure how this
is working...

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