[PATCH 5.12 503/677] ASoC: simple-card: fix possible uninitialized single_cpu local variable

[Greg Kroah-Hartman]

From: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>

[ Upstream commit fa74c223b6fd78a5314b4c61b9abdbed3c2185b4 ]

The 'single_cpu' local variable is assigned by asoc_simple_parse_dai()
and later used in a asoc_simple_canonicalize_cpu() call, assuming the
entire function did not exit on errors.

However the first function returns 0 if passed device_node is NULL,
thus leaving the variable uninitialized and reporting success.

Addresses-Coverity: Uninitialized scalar variable
Fixes: 8f7f298a3337 ("ASoC: simple-card-utils: separate asoc_simple_card_parse_dai()")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>
Acked-by: Sameer Pujar <spujar@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210407092027.60769-1-krzysztof.kozlowski@xxxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 sound/soc/generic/audio-graph-card.c | 2 +-
 sound/soc/generic/simple-card.c      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/generic/audio-graph-card.c b/sound/soc/generic/audio-graph-card.c
index 8c5cdcdc8713..e81b5cf0d37a 100644
--- a/sound/soc/generic/audio-graph-card.c
+++ b/sound/soc/generic/audio-graph-card.c
@@ -380,7 +380,7 @@ static int graph_dai_link_of(struct asoc_simple_priv *priv,
 	struct device_node *top = dev->of_node;
 	struct asoc_simple_dai *cpu_dai;
 	struct asoc_simple_dai *codec_dai;
-	int ret, single_cpu;
+	int ret, single_cpu = 0;
 
 	/* Do it only CPU turn */
 	if (!li->cpu)
diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
index 75365c7bb393..d916ec69c24f 100644
--- a/sound/soc/generic/simple-card.c
+++ b/sound/soc/generic/simple-card.c
@@ -258,7 +258,7 @@ static int simple_dai_link_of(struct asoc_simple_priv *priv,
 	struct device_node *plat = NULL;
 	char prop[128];
 	char *prefix = "";
-	int ret, single_cpu;
+	int ret, single_cpu = 0;
 
 	/*
 	 *	 |CPU   |Codec   : turn
-- 
2.30.2