Re: [PATCH 2/2] ASoC: topology: Fix a small leak in soc_tplg_dapm_graph_elems_load()

On 5/20/2021 7:07 AM, Dan Carpenter wrote:

We have to kfree(routes) on this error path.

Fixes: ff9226224437 ("ASoC: topology: Change allocations to resource managed") Signed-off-by: Dan Carpenter dan.carpenter@oracle.com

---

sound/soc/soc-topology.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c index 6b7a813bc264..5730fcaa7bc6 100644 --- a/sound/soc/soc-topology.c +++ b/sound/soc/soc-topology.c @@ -1135,8 +1135,10 @@ static int soc_tplg_dapm_graph_elems_load(struct soc_tplg *tplg, */ for (i = 0; i < count; i++) { routes[i] = devm_kzalloc(tplg->dev, sizeof(*routes[i]), GFP_KERNEL);

• if (!routes[i])
  

• 	return -ENOMEM;
  

• if (!routes[i]) {
  

• 	ret = -ENOMEM;
  

• 	goto free_routes;
  

• }
  

  }

  for (i = 0; i < count; i++) {

@@ -1198,6 +1200,7 @@ static int soc_tplg_dapm_graph_elems_load(struct soc_tplg *tplg, * The memory allocated for each dapm route will be freed * when it is removed in remove_route(). */ +free_routes: kfree(routes);

return ret;

Yes, that's right, however looking at this function again, I wonder if instead we can just get rid of the routes array and kcalloc call?

Something along those lines (hope that copy paste won't mess it up):

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c index 73076d425efb..13db9cfe223f 100644 --- a/sound/soc/soc-topology.c +++ b/sound/soc/soc-topology.c @@ -1104,7 +1104,7 @@ static int soc_tplg_dapm_graph_elems_load(struct soc_tplg *tplg, { struct snd_soc_dapm_context *dapm = &tplg->comp->dapm; struct snd_soc_tplg_dapm_graph_elem *elem; - struct snd_soc_dapm_route **routes; + struct snd_soc_dapm_route *route; int count, i; int ret = 0;

@@ -1122,28 +1122,15 @@ static int soc_tplg_dapm_graph_elems_load(struct soc_tplg *tplg, dev_dbg(tplg->dev, "ASoC: adding %d DAPM routes for index %d\n", count, hdr->index);

- /* allocate memory for pointer to array of dapm routes */ - routes = kcalloc(count, sizeof(struct snd_soc_dapm_route *), - GFP_KERNEL); - if (!routes) - return -ENOMEM; - - /* - * allocate memory for each dapm route in the array. - * This needs to be done individually so that - * each route can be freed when it is removed in remove_route(). - */ for (i = 0; i < count; i++) { - routes[i] = devm_kzalloc(tplg->dev, sizeof(*routes[i]), GFP_KERNEL); - if (!routes[i]) + route = devm_kzalloc(tplg->dev, sizeof(*route), GFP_KERNEL); + if (!route) return -ENOMEM; - }

- for (i = 0; i < count; i++) { elem = (struct snd_soc_tplg_dapm_graph_elem *)tplg->pos; tplg->pos += sizeof(struct snd_soc_tplg_dapm_graph_elem);

- /* validate routes */ + /* validate route */ if (strnlen(elem->source, SNDRV_CTL_ELEM_ID_NAME_MAXLEN) == SNDRV_CTL_ELEM_ID_NAME_MAXLEN) { ret = -EINVAL; @@ -1160,46 +1147,32 @@ static int soc_tplg_dapm_graph_elems_load(struct soc_tplg *tplg, break; }

- routes[i]->source = elem->source; - routes[i]->sink = elem->sink; + route->source = elem->source; + route->sink = elem->sink;

/* set to NULL atm for tplg users */ - routes[i]->connected = NULL; + route->connected = NULL; if (strnlen(elem->control, SNDRV_CTL_ELEM_ID_NAME_MAXLEN) == 0) - routes[i]->control = NULL; + route->control = NULL; else - routes[i]->control = elem->control; + route->control = elem->control;

/* add route dobj to dobj_list */ - routes[i]->dobj.type = SND_SOC_DOBJ_GRAPH; - routes[i]->dobj.ops = tplg->ops; - routes[i]->dobj.index = tplg->index; - list_add(&routes[i]->dobj.list, &tplg->comp->dobj_list); + route->dobj.type = SND_SOC_DOBJ_GRAPH; + route->dobj.ops = tplg->ops; + route->dobj.index = tplg->index; + list_add(&route->dobj.list, &tplg->comp->dobj_list);

- ret = soc_tplg_add_route(tplg, routes[i]); + ret = soc_tplg_add_route(tplg, route); if (ret < 0) { dev_err(tplg->dev, "ASoC: topology: add_route failed: %d\n", ret); - /* - * this route was added to the list, it will - * be freed in remove_route() so increment the - * counter to skip it in the error handling - * below. - */ - i++; break; }

/* add route, but keep going if some fail */ - snd_soc_dapm_add_routes(dapm, routes[i], 1); + snd_soc_dapm_add_routes(dapm, route, 1); }

- /* - * free pointer to array of dapm routes as this is no longer needed. - * The memory allocated for each dapm route will be freed - * when it is removed in remove_route(). - */ - kfree(routes); - return ret; }