From: Nathan Chancellor natechancellor@gmail.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@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 --- 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);