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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
        Sameer Pujar <spujar@nvidia.com>,
        Mark Brown <broonie@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.4 184/244] ASoC: simple-card: fix possible uninitialized single_cpu local variable
Date:   Wed, 12 May 2021 16:49:15 +0200
Message-Id: <20210512144748.884068594@linuxfoundation.org>
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From: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

[ 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@canonical.com>
Acked-by: Sameer Pujar <spujar@nvidia.com>
Link: https://lore.kernel.org/r/20210407092027.60769-1-krzysztof.kozlowski@canonical.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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 6007e6305735..1bc498124689 100644
--- a/sound/soc/generic/audio-graph-card.c
+++ b/sound/soc/generic/audio-graph-card.c
@@ -340,7 +340,7 @@ 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 fc9c753db8dd..4484c40c7a39 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