1 files changed, 31 insertions, 16 deletions

diff --git a/sound/pci/hda/hda_cs_dsp_ctl.c b/sound/pci/hda/hda_cs_dsp_ctl.c
index 463ca06036..9db45d7c17 100644
--- a/sound/pci/hda/hda_cs_dsp_ctl.c
+++ b/sound/pci/hda/hda_cs_dsp_ctl.c
@@ -8,6 +8,7 @@
 
 #include <linux/module.h>
 #include <sound/soc.h>
+#include <linux/cleanup.h>
 #include <linux/firmware/cirrus/cs_dsp.h>
 #include <linux/firmware/cirrus/wmfw.h>
 #include "hda_cs_dsp_ctl.h"
@@ -97,11 +98,23 @@ static unsigned int wmfw_convert_flags(unsigned int in)
 	return out;
 }
 
-static void hda_cs_dsp_add_kcontrol(struct hda_cs_dsp_coeff_ctl *ctl, const char *name)
+static void hda_cs_dsp_free_kcontrol(struct snd_kcontrol *kctl)
 {
+	struct hda_cs_dsp_coeff_ctl *ctl = (struct hda_cs_dsp_coeff_ctl *)snd_kcontrol_chip(kctl);
 	struct cs_dsp_coeff_ctl *cs_ctl = ctl->cs_ctl;
+
+	/* NULL priv to prevent a double-free in hda_cs_dsp_control_remove() */
+	cs_ctl->priv = NULL;
+	kfree(ctl);
+}
+
+static void hda_cs_dsp_add_kcontrol(struct cs_dsp_coeff_ctl *cs_ctl,
+				    const struct hda_cs_dsp_ctl_info *info,
+				    const char *name)
+{
 	struct snd_kcontrol_new kcontrol = {0};
 	struct snd_kcontrol *kctl;
+	struct hda_cs_dsp_coeff_ctl *ctl __free(kfree) = NULL;
 	int ret = 0;
 
 	if (cs_ctl->len > ADSP_MAX_STD_CTRL_SIZE) {
@@ -110,6 +123,13 @@ static void hda_cs_dsp_add_kcontrol(struct hda_cs_dsp_coeff_ctl *ctl, const char
 		return;
 	}
 
+	ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
+	if (!ctl)
+		return;
+
+	ctl->cs_ctl = cs_ctl;
+	ctl->card = info->card;
+
 	kcontrol.name = name;
 	kcontrol.info = hda_cs_dsp_coeff_info;
 	kcontrol.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
@@ -117,20 +137,22 @@ static void hda_cs_dsp_add_kcontrol(struct hda_cs_dsp_coeff_ctl *ctl, const char
 	kcontrol.get = hda_cs_dsp_coeff_get;
 	kcontrol.put = hda_cs_dsp_coeff_put;
 
-	/* Save ctl inside private_data, ctl is owned by cs_dsp,
-	 * and will be freed when cs_dsp removes the control */
 	kctl = snd_ctl_new1(&kcontrol, (void *)ctl);
 	if (!kctl)
 		return;
 
-	ret = snd_ctl_add(ctl->card, kctl);
+	kctl->private_free = hda_cs_dsp_free_kcontrol;
+	ctl->kctl = kctl;
+
+	/* snd_ctl_add() calls our private_free on error, which will kfree(ctl) */
+	cs_ctl->priv = no_free_ptr(ctl);
+	ret = snd_ctl_add(info->card, kctl);
 	if (ret) {
 		dev_err(cs_ctl->dsp->dev, "Failed to add KControl %s = %d\n", kcontrol.name, ret);
 		return;
 	}
 
 	dev_dbg(cs_ctl->dsp->dev, "Added KControl: %s\n", kcontrol.name);
-	ctl->kctl = kctl;
 }
 
 static void hda_cs_dsp_control_add(struct cs_dsp_coeff_ctl *cs_ctl,
@@ -138,7 +160,6 @@ static void hda_cs_dsp_control_add(struct cs_dsp_coeff_ctl *cs_ctl,
 {
 	struct cs_dsp *cs_dsp = cs_ctl->dsp;
 	char name[SNDRV_CTL_ELEM_ID_NAME_MAXLEN];
-	struct hda_cs_dsp_coeff_ctl *ctl;
 	const char *region_name;
 	int ret;
 
@@ -163,15 +184,7 @@ static void hda_cs_dsp_control_add(struct cs_dsp_coeff_ctl *cs_ctl,
 			 " %.*s", cs_ctl->subname_len - skip, cs_ctl->subname + skip);
 	}
 
-	ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
-	if (!ctl)
-		return;
-
-	ctl->cs_ctl = cs_ctl;
-	ctl->card = info->card;
-	cs_ctl->priv = ctl;
-
-	hda_cs_dsp_add_kcontrol(ctl, name);
+	hda_cs_dsp_add_kcontrol(cs_ctl, info, name);
 }
 
 void hda_cs_dsp_add_controls(struct cs_dsp *dsp, const struct hda_cs_dsp_ctl_info *info)
@@ -203,7 +216,9 @@ void hda_cs_dsp_control_remove(struct cs_dsp_coeff_ctl *cs_ctl)
 {
 	struct hda_cs_dsp_coeff_ctl *ctl = cs_ctl->priv;
 
-	kfree(ctl);
+	/* ctl and kctl may already have been removed by ALSA private_free */
+	if (ctl && ctl->kctl)
+		snd_ctl_remove(ctl->card, ctl->kctl);
 }
 EXPORT_SYMBOL_NS_GPL(hda_cs_dsp_control_remove, SND_HDA_CS_DSP_CONTROLS);