ASoC: qcom: common: Fix refcount imbalance on error

BugLink: https://bugs.launchpad.net/bugs/1896828
[ Upstream commit c1e6414cdc371f9ed82cefebba7538499a3059f9 ]

for_each_child_of_node returns a node pointer np with
refcount incremented. So when devm_kzalloc fails, a
pairing refcount decrement is needed to keep np's
refcount balanced.

Fixes: 16395ceee11f8 ("ASoC: qcom: common: Fix NULL pointer in of parser")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Link: https://lore.kernel.org/r/20200820042828.10308-1-dinghao.liu@zju.edu.cn
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: William Breathitt Gray <william.gray@canonical.com>

diff --git a/sound/soc/qcom/common.c b/sound/soc/qcom/common.c
index 8ada4ecba847269266a19486d823432b6964924b..10322690c0eaa6b46537091694e3e8036a4c6ccf 100644 (file)
--- a/sound/soc/qcom/common.c
+++ b/sound/soc/qcom/common.c
@@ -45,8 +45,10 @@ int qcom_snd_parse_of(struct snd_soc_card *card)
 
        for_each_child_of_node(dev->of_node, np) {
                dlc = devm_kzalloc(dev, 2 * sizeof(*dlc), GFP_KERNEL);
-               if (!dlc)
-                       return -ENOMEM;
+               if (!dlc) {
+                       ret = -ENOMEM;
+                       goto err;
+               }
 
                link->cpus      = &dlc[0];
                link->platforms = &dlc[1];