linux-kernel - [PATCH] spi: bcm2835aux: Restore err assignment in bcm2835aux_spi

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Message-Id: <20201113180701.455541-1-natechancellor@gmail.com>
Date:   Fri, 13 Nov 2020 11:07:02 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Vladimir Oltean <olteanv@...il.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Lukas Wunner <lukas@...ner.de>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] spi: bcm2835aux: Restore err assignment in bcm2835aux_spi_probe

Clang warns:

drivers/spi/spi-bcm2835aux.c:532:50: warning: variable 'err' is
uninitialized when used here [-Wuninitialized]
                dev_err(&pdev->dev, "could not get clk: %d\n", err);
                                                               ^~~
./include/linux/dev_printk.h:112:32: note: expanded from macro 'dev_err'
        _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
                                      ^~~~~~~~~~~
drivers/spi/spi-bcm2835aux.c:495:9: note: initialize the variable 'err'
to silence this warning
        int err;
               ^
                = 0
1 warning generated.

Restore the assignment so that the error value can be used in the
dev_err statement and there is no uninitialized memory being leaked.

Fixes: e13ee6cc4781 ("spi: bcm2835aux: Fix use-after-free on unbind")
Link: https://github.com/ClangBuiltLinux/linux/issues/1199
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 drivers/spi/spi-bcm2835aux.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-bcm2835aux.c b/drivers/spi/spi-bcm2835aux.c
index fd58547110e6..1a26865c42f8 100644
--- a/drivers/spi/spi-bcm2835aux.c
+++ b/drivers/spi/spi-bcm2835aux.c
@@ -529,8 +529,9 @@ static int bcm2835aux_spi_probe(struct platform_device *pdev)
 
 	bs->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(bs->clk)) {
+		err = PTR_ERR(bs->clk);
 		dev_err(&pdev->dev, "could not get clk: %d\n", err);
-		return PTR_ERR(bs->clk);
+		return err;
 	}
 
 	bs->irq = platform_get_irq(pdev, 0);

base-commit: c371dcf51cef4ae53d00090a148d004b113217f0
-- 
2.29.2