[PATCH AUTOSEL 4.19 17/53] ASoC: dapm: Fix NULL pointer dereference in snd_soc_dapm_free_kcontrol

[Sasha Levin]

From: Pankaj Bharadiya <pankaj.laxminarayan.bharad...@intel.com>

[ Upstream commit cacea3a90e211f0c111975535508d446a4a928d2 ]

w_text_param can be NULL and it is being dereferenced without checking.
Add the missing sanity check to prevent  NULL pointer dereference.

Signed-off-by: Pankaj Bharadiya <pankaj.laxminarayan.bharad...@intel.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.boss...@linux.intel.com>
Signed-off-by: Mark Brown <broo...@kernel.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 sound/soc/soc-dapm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 9b78fb3daa7b..2257b1b0151c 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -3847,6 +3847,10 @@ snd_soc_dapm_free_kcontrol(struct snd_soc_card *card,
        int count;
 
        devm_kfree(card->dev, (void *)*private_value);
+
+       if (!w_param_text)
+               return;
+
        for (count = 0 ; count < num_params; count++)
                devm_kfree(card->dev, (void *)w_param_text[count]);
        devm_kfree(card->dev, w_param_text);
-- 
2.19.1