From 267e2c6fd7ca3d4076d20f9d52d49dc91addfe9d Mon Sep 17 00:00:00 2001 From: Liam Girdwood Date: Tue, 27 Mar 2018 12:04:04 +0100 Subject: [PATCH] ASoC: topology: Fix kcontrol name string handling Fix the topology kcontrol string handling so that string pointer references are strdup()ed instead of being copied. This fixes issues with kcontrol templates on the stack or ones that are freed. Remember and free the strings too when topology is unloaded. Signed-off-by: Liam Girdwood Signed-off-by: Mark Brown Cc: stable@vger.kernel.org --- sound/soc/soc-topology.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c index 01a5041..782c580 100644 --- a/sound/soc/soc-topology.c +++ b/sound/soc/soc-topology.c @@ -523,6 +523,7 @@ static void remove_widget(struct snd_soc_component *comp, kfree(se->dobj.control.dtexts[j]); kfree(se); + kfree(w->kcontrol_news[i].name); } kfree(w->kcontrol_news); } else { @@ -540,6 +541,7 @@ static void remove_widget(struct snd_soc_component *comp, */ kfree((void *)kcontrol->private_value); snd_ctl_remove(card, kcontrol); + kfree(w->kcontrol_news[i].name); } kfree(w->kcontrol_news); } @@ -1233,7 +1235,9 @@ static struct snd_kcontrol_new *soc_tplg_dapm_widget_dmixer_create( dev_dbg(tplg->dev, " adding DAPM widget mixer control %s at %d\n", mc->hdr.name, i); - kc[i].name = mc->hdr.name; + kc[i].name = kstrdup(mc->hdr.name, GFP_KERNEL); + if (kc[i].name == NULL) + goto err_str; kc[i].private_value = (long)sm; kc[i].iface = SNDRV_CTL_ELEM_IFACE_MIXER; kc[i].access = mc->hdr.access; @@ -1278,8 +1282,10 @@ static struct snd_kcontrol_new *soc_tplg_dapm_widget_dmixer_create( err_str: kfree(sm); err: - for (--i; i >= 0; i--) + for (--i; i >= 0; i--) { kfree((void *)kc[i].private_value); + kfree(kc[i].name); + } kfree(kc); return NULL; } @@ -1310,7 +1316,9 @@ static struct snd_kcontrol_new *soc_tplg_dapm_widget_denum_create( dev_dbg(tplg->dev, " adding DAPM widget enum control %s\n", ec->hdr.name); - kc[i].name = ec->hdr.name; + kc[i].name = kstrdup(ec->hdr.name, GFP_KERNEL); + if (kc[i].name == NULL) + goto err_se; kc[i].private_value = (long)se; kc[i].iface = SNDRV_CTL_ELEM_IFACE_MIXER; kc[i].access = ec->hdr.access; @@ -1386,6 +1394,7 @@ err_se: kfree(se->dobj.control.dtexts[j]); kfree(se); + kfree(kc[i].name); } err: kfree(kc); @@ -1424,7 +1433,9 @@ static struct snd_kcontrol_new *soc_tplg_dapm_widget_dbytes_create( "ASoC: adding bytes kcontrol %s with access 0x%x\n", be->hdr.name, be->hdr.access); - kc[i].name = be->hdr.name; + kc[i].name = kstrdup(be->hdr.name, GFP_KERNEL); + if (kc[i].name == NULL) + goto err; kc[i].private_value = (long)sbe; kc[i].iface = SNDRV_CTL_ELEM_IFACE_MIXER; kc[i].access = be->hdr.access; @@ -1454,8 +1465,10 @@ static struct snd_kcontrol_new *soc_tplg_dapm_widget_dbytes_create( return kc; err: - for (--i; i >= 0; i--) + for (--i; i >= 0; i--) { kfree((void *)kc[i].private_value); + kfree(kc[i].name); + } kfree(kc); return NULL; -- 2.7.4