spi: bcm2835aux: Restore err assignment in bcm2835aux_spi_probe

[ 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@gmail.com>
Link: https://lore.kernel.org/r/20201113180701.455541-1-natechancellor@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
[lukas: backport to 4.19-stable, add stable designation]
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: <stable@vger.kernel.org> # v4.4+: e13ee6cc4781: spi: bcm2835aux: Fix use-after-free on unbind
Cc: <stable@vger.kernel.org> # v4.4+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/spi/spi-bcm2835aux.c b/drivers/spi/spi-bcm2835aux.c
index 79edab7b384ce49a7fb0523d57090813d4882860..0b5aff090b2e30298b9005e655fea0cfe77a3efb 100644 (file)
--- a/drivers/spi/spi-bcm2835aux.c
+++ b/drivers/spi/spi-bcm2835aux.c
@@ -416,8 +416,9 @@ static int bcm2835aux_spi_probe(struct platform_device *pdev)
 
        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);