[4/4] ASoC: soc-dapm.c: fixup snd_soc_dapm_new_control_unlocked() error handling

Commit Message

Kuninori Morimoto Sept. 5, 2022, 11:17 p.m. UTC

From: Kuninori Morimoto <[e-mail]>

Current snd_soc_dapm_new_control_unlocked() error handling is wrong.
It is using "goto request_failed" (A), but error message is using
"w->name" (B) which is not yet created in such timing.

	snd_soc_dapm_new_control_unlocked(xxx)
	{
		...
		switch (w->id) {
		case xxx:
			...
			if (IS_ERR(...)) {
				ret = PTR_ERR(...);
(A)				goto request_failed;
			}
		...
		}

		prefix = soc_dapm_prefix(...);
		if (prefix)
(B)			w->name = kasprintf(...);
		else
(B)			w->name = kstrdup_const(...);
		...

(A)	request_failed:
		if (ret != -EPROBE_DEFER)
(B)			dev_err(..., w->name, ...);

		return ...;
	}

we can create "w->name" at beginning of this function.
In such case, we need to call kfree_const(w->name) at error case.
This patch do these.

Signed-off-by: Kuninori Morimoto <[e-mail]>
---
 sound/soc/soc-dapm.c | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

Patch

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index e8c813586b53..928e3bfe7457 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -3630,10 +3630,18 @@  snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
 	enum snd_soc_dapm_direction dir;
 	struct snd_soc_dapm_widget *w;
 	const char *prefix;
-	int ret;
+	int ret = -ENOMEM;
 
 	if ((w = dapm_cnew_widget(widget)) == NULL)
-		return ERR_PTR(-ENOMEM);
+		goto cnew_failed;
+
+	prefix = soc_dapm_prefix(dapm);
+	if (prefix)
+		w->name = kasprintf(GFP_KERNEL, "%s %s", prefix, widget->name);
+	else
+		w->name = kstrdup_const(widget->name, GFP_KERNEL);
+	if (!w->name)
+		goto name_failed;
 
 	switch (w->id) {
 	case snd_soc_dapm_regulator_supply:
@@ -3672,17 +3680,6 @@  snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
 		break;
 	}
 
-	prefix = soc_dapm_prefix(dapm);
-	if (prefix)
-		w->name = kasprintf(GFP_KERNEL, "%s %s", prefix, widget->name);
-	else
-		w->name = kstrdup_const(widget->name, GFP_KERNEL);
-	if (w->name == NULL) {
-		kfree_const(w->sname);
-		kfree(w);
-		return ERR_PTR(-ENOMEM);
-	}
-
 	switch (w->id) {
 	case snd_soc_dapm_mic:
 		w->is_ep = SND_SOC_DAPM_EP_SOURCE;
@@ -3770,9 +3767,11 @@  snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
 	if (ret != -EPROBE_DEFER)
 		dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
 			w->name, ret);
-
+	kfree_const(w->name);
+name_failed:
 	kfree_const(w->sname);
 	kfree(w);
+cnew_failed:
 	return ERR_PTR(ret);
 }