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audio: drc: register IPC-time blob validator #10943

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audio: drc: register IPC-time blob validator #10943

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28 changes: 22 additions & 6 deletions src/audio/drc/drc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -139,6 +139,20 @@ static int drc_setup(struct processing_module *mod, uint16_t channels, uint32_t
return drc_set_pre_delay_time(&cd->state, cd->config->params.pre_delay_time, rate);
}

static int drc_validator(struct comp_dev *dev, void *new_data, uint32_t new_data_size)
{
struct sof_drc_config *config = new_data;

if (new_data_size != sizeof(struct sof_drc_config) ||
new_data_size != config->size) {
comp_err(dev, "invalid configuration blob, size %u, expected %zu",
new_data_size, sizeof(struct sof_drc_config));
return -EINVAL;
}

return 0;
}

/*
* End of DRC setup code. Next the standard component methods.
*/
Expand Down Expand Up @@ -168,6 +182,11 @@ __cold static int drc_init(struct processing_module *mod)
goto cd_fail;
}

/* Reject malformed blobs at IPC time so a bad run-time update cannot
* replace the working configuration.
*/
comp_data_blob_set_validator(cd->model_handler, drc_validator);

drc_reset_state(mod, &cd->state);

/* Initialize DRC to enabled. If defined by topology, a control may set
Expand Down Expand Up @@ -326,7 +345,6 @@ static int drc_prepare(struct processing_module *mod,
struct drc_comp_data *cd = module_get_private_data(mod);
struct comp_buffer *sourceb, *sinkb;
struct comp_dev *dev = mod->dev;
size_t data_size;
int channels;
int rate;
int ret;
Expand All @@ -352,11 +370,9 @@ static int drc_prepare(struct processing_module *mod,

/* Initialize DRC */
comp_info(dev, "source_format=%d", cd->source_format);
cd->config = comp_get_data_blob(cd->model_handler, &data_size, NULL);
/* the blob is dereferenced as a struct sof_drc_config below and in
* drc_setup(), so require it to be at least that large
*/
if (cd->config && data_size >= sizeof(struct sof_drc_config)) {
cd->config = comp_get_data_blob(cd->model_handler, NULL, NULL);

if (cd->config) {
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ret = drc_setup(mod, channels, rate);
if (ret < 0) {
comp_err(dev, "error: drc_setup failed.");
Expand Down
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