Add check runtime module pointers before freeing them, and clear them to NULL after freed.
With this implemented, we can avoid NULL pointer dereference or double free errors.
Signed-off-by: Jie Yang yang.jie@intel.com --- sound/soc/intel/haswell/sst-haswell-pcm.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/sound/soc/intel/haswell/sst-haswell-pcm.c b/sound/soc/intel/haswell/sst-haswell-pcm.c index 23ae040..f97fa5a 100644 --- a/sound/soc/intel/haswell/sst-haswell-pcm.c +++ b/sound/soc/intel/haswell/sst-haswell-pcm.c @@ -928,10 +928,15 @@ static void hsw_pcm_free_modules(struct hsw_priv_data *pdata)
for (i = 0; i < ARRAY_SIZE(mod_map); i++) { pcm_data = &pdata->pcm[mod_map[i].dai_id][mod_map[i].stream]; - sst_hsw_runtime_module_free(pcm_data->runtime); + if (pcm_data->runtime){ + sst_hsw_runtime_module_free(pcm_data->runtime); + pcm_data->runtime = NULL; + } } - if (sst_hsw_is_module_loaded(hsw, SST_HSW_MODULE_WAVES)) { + if (sst_hsw_is_module_loaded(hsw, SST_HSW_MODULE_WAVES) && + pdata->runtime_waves) { sst_hsw_runtime_module_free(pdata->runtime_waves); + pdata->runtime_waves = NULL; } }