linux-kernel - [PATCH 4.4 002/132] spi: bcm2835aux: Restore err assignment in bcm2835aux_spi

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Date:   Mon, 28 Dec 2020 13:48:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Nathan Chancellor <natechancellor@...il.com>,
        Mark Brown <broonie@...nel.org>, Lukas Wunner <lukas@...ner.de>
Subject: [PATCH 4.4 002/132] spi: bcm2835aux: Restore err assignment in bcm2835aux_spi_probe

From: Nathan Chancellor <natechancellor@...il.com>

[ Upstream commit d853b3406903a7dc5b14eb5bada3e8cd677f66a2 ]

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>
Link: https://lore.kernel.org/r/20201113180701.455541-1-natechancellor@gmail.com
Signed-off-by: Mark Brown <broonie@...nel.org>
[lukas: backport to 4.19-stable, add stable designation]
Signed-off-by: Lukas Wunner <lukas@...ner.de>
Cc: <stable@...r.kernel.org> # v4.4+: e13ee6cc4781: spi: bcm2835aux: Fix use-after-free on unbind
Cc: <stable@...r.kernel.org> # v4.4+
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/spi/spi-bcm2835aux.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/spi/spi-bcm2835aux.c
+++ b/drivers/spi/spi-bcm2835aux.c
@@ -416,8 +416,9 @@ static int bcm2835aux_spi_probe(struct p
 
 	bs->clk = devm_clk_get(&pdev->dev, NULL);
 	if ((!bs->clk) || (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);