[PATCH 5.0 28/95] ASoC: dapm: Fix NULL pointer dereference in snd_soc_dapm_free_kcontrol

Greg Kroah-Hartman
2019-05-09T19:01:23Z

[ 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.bharadiya@intel.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@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 20bad755888b1..08ab5fef75dca 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -3840,6 +3840,10 @@ 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);
--
2.20.1