From: Bjorn Andersson <bjorn.andersson@linaro.org>
Date: Tue, 18 Jun 2019 05:28:13 +0000 (-0700)
Subject: ASoC: qcom: common: Fix NULL pointer in of parser
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=16395ceee11f8f8af764bac76adc20a43ba1a153;p=openwrt%2Fstaging%2Fblogic.git

ASoC: qcom: common: Fix NULL pointer in of parser

A snd_soc_dai_link_component is allocated and associated with the first
link, so when the code tries to assign the of_node of the second link's
"cpu" member it dereferences a NULL pointer.

Fix this by moving the allocation and assignement of
snd_soc_dai_link_components into the loop, giving us one pair per link.

Fixes: 1e36ea360ab9 ("ASoC: qcom: common: use modern dai_link style")
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
---

diff --git a/sound/soc/qcom/common.c b/sound/soc/qcom/common.c
index c7a878507220..97488b5cc515 100644
--- a/sound/soc/qcom/common.c
+++ b/sound/soc/qcom/common.c
@@ -42,17 +42,17 @@ int qcom_snd_parse_of(struct snd_soc_card *card)
 	card->num_links = num_links;
 	link = card->dai_link;
 
-	dlc = devm_kzalloc(dev, 2 * sizeof(*dlc), GFP_KERNEL);
-	if (!dlc)
-		return -ENOMEM;
+	for_each_child_of_node(dev->of_node, np) {
+		dlc = devm_kzalloc(dev, 2 * sizeof(*dlc), GFP_KERNEL);
+		if (!dlc)
+			return -ENOMEM;
 
-	link->cpus	= &dlc[0];
-	link->platforms	= &dlc[1];
+		link->cpus	= &dlc[0];
+		link->platforms	= &dlc[1];
 
-	link->num_cpus		= 1;
-	link->num_platforms	= 1;
+		link->num_cpus		= 1;
+		link->num_platforms	= 1;
 
-	for_each_child_of_node(dev->of_node, np) {
 		cpu = of_get_child_by_name(np, "cpu");
 		platform = of_get_child_by_name(np, "platform");
 		codec = of_get_child_by_name(np, "codec");