linux-kernel - [PATCH] ASoC: dapm: Fix NULL pointer dereference in snd_soc_dapm_new

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Date:   Thu, 21 Mar 2019 15:41:25 +0530
From:   Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@...el.com>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org,
        pankaj.laxminarayan.bharadiya@...el.com
Subject: [PATCH] ASoC: dapm: Fix NULL pointer dereference in snd_soc_dapm_new_dai

In case of single config, w_param_text is NULL.
In snd_soc_dapm_new_control_unlocked() call failure case, it will end
up calling snd_soc_dapm_free_kcontrol() unconditionally and result in
NULL pointer dereference.

Signed-off-by: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@...el.com>
---
 sound/soc/soc-dapm.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 1ec06ef..ba6cb37 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -4094,8 +4094,9 @@ snd_soc_dapm_new_dai(struct snd_soc_card *card, struct snd_soc_pcm_runtime *rtd,
 
 outfree_kcontrol_news:
 	devm_kfree(card->dev, (void *)template.kcontrol_news);
-	snd_soc_dapm_free_kcontrol(card, &private_value,
-				   rtd->dai_link->num_params, w_param_text);
+	if (w_param_text)
+		snd_soc_dapm_free_kcontrol(card, &private_value,
+				rtd->dai_link->num_params, w_param_text);
 param_fail:
 	devm_kfree(card->dev, link_name);
 	return ERR_PTR(ret);
-- 
2.7.4