[PATCH 4.20 08/88] clk: tegra: dfll: Fix a potential Oop in remove()

[Greg Kroah-Hartman]

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit d39eca547f3ec67140a5d765a426eb157b978a59 ]

If tegra_dfll_unregister() fails then "soc" is an error pointer.  We
should just return instead of dereferencing it.

Fixes: 1752c9ee23fb ("clk: tegra: dfll: Fix drvdata overwriting issue")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Stephen Boyd <sb...@kernel.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/clk/tegra/clk-tegra124-dfll-fcpu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/tegra/clk-tegra124-dfll-fcpu.c 
b/drivers/clk/tegra/clk-tegra124-dfll-fcpu.c
index 269d3595758be..edc31bb56674a 100644
--- a/drivers/clk/tegra/clk-tegra124-dfll-fcpu.c
+++ b/drivers/clk/tegra/clk-tegra124-dfll-fcpu.c
@@ -133,9 +133,11 @@ static int tegra124_dfll_fcpu_remove(struct 
platform_device *pdev)
        struct tegra_dfll_soc_data *soc;
 
        soc = tegra_dfll_unregister(pdev);
-       if (IS_ERR(soc))
+       if (IS_ERR(soc)) {
                dev_err(&pdev->dev, "failed to unregister DFLL: %ld\n",
                        PTR_ERR(soc));
+               return PTR_ERR(soc);
+       }
 
        tegra_cvb_remove_opp_table(soc->dev, soc->cvb, soc->max_freq);
 
-- 
2.19.1