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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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41 changes: 38 additions & 3 deletions src/audio/drc/drc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -139,6 +139,34 @@ 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_check_blob_size(struct comp_dev *dev, size_t size)
{
if (size != sizeof(struct sof_drc_config)) {
comp_err(dev, "invalid configuration blob, size %zu", size);
return -EINVAL;
}

return 0;
}

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

ret = drc_check_blob_size(dev, new_data_size);
if (ret < 0)
return ret;

if (config->size != new_data_size) {
comp_err(dev, "blob size %u / header size %u mismatch",
new_data_size, config->size);
return -EINVAL;
}

return 0;
}

/*
* End of DRC setup code. Next the standard component methods.
*/
Expand Down Expand Up @@ -353,10 +381,10 @@ 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
/* The blob is dereferenced as a struct sof_drc_config below and in
* drc_setup(), so size-check it before use.
*/
if (cd->config && data_size >= sizeof(struct sof_drc_config)) {
if (cd->config && drc_check_blob_size(dev, data_size) == 0) {
ret = drc_setup(mod, channels, rate);
if (ret < 0) {
comp_err(dev, "error: drc_setup failed.");
Expand All @@ -382,6 +410,11 @@ static int drc_prepare(struct processing_module *mod,
cd->drc_func = drc_default_pass;
}

/* 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);

comp_info(dev, "DRC is configured.");
return 0;
}
Expand All @@ -390,6 +423,8 @@ static int drc_reset(struct processing_module *mod)
{
struct drc_comp_data *cd = module_get_private_data(mod);

comp_data_blob_set_validator(cd->model_handler, NULL);

drc_reset_state(mod, &cd->state);

return 0;
Expand Down
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