linux-kernel - [PATCH AUTOSEL 4.19 005/237] pinctrl: madera: Fix uninitialized variable bug in madera_mux_set

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Date:   Sat, 16 Nov 2019 10:37:20 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Sasha Levin <sashal@...nel.org>, patches@...nsource.cirrus.com,
        linux-gpio@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 005/237] pinctrl: madera: Fix uninitialized variable bug in madera_mux_set_mux

From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>

[ Upstream commit 4fe81669df50889ff1072c030c59df5f1fa6534e ]

There is a potential execution path in which variable *ret* is checked
in an IF statement, and then its value is used to report an error at
line 659 without being properly initialized previously:

659 if (ret)
660	dev_err(priv->dev, "Failed to write to 0x%x (%d)\n", reg, ret);

Fix this by initializing variable *ret* to 0 in order to
avoid unpredictable or unintended results.

Addresses-Coverity-ID: 1471969 ("Uninitialized scalar variable")
Fixes: 218d72a77b0b ("pinctrl: madera: Add driver for Cirrus Logic Madera codecs")
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
Acked-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pinctrl/cirrus/pinctrl-madera-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pinctrl/cirrus/pinctrl-madera-core.c b/drivers/pinctrl/cirrus/pinctrl-madera-core.c
index c4f4d904e4a61..618e04407ac85 100644
--- a/drivers/pinctrl/cirrus/pinctrl-madera-core.c
+++ b/drivers/pinctrl/cirrus/pinctrl-madera-core.c
@@ -608,7 +608,7 @@ static int madera_mux_set_mux(struct pinctrl_dev *pctldev,
 	unsigned int n_chip_groups = priv->chip->n_pin_groups;
 	const char *func_name = madera_mux_funcs[selector].name;
 	unsigned int reg;
-	int i, ret;
+	int i, ret = 0;
 
 	dev_dbg(priv->dev, "%s selecting %u (%s) for group %u (%s)\n",
 		__func__, selector, func_name, group,
-- 
2.20.1