regulator: fix crash caused by null driver data

commit fb6de923ca3358a91525552b4907d4cb38730bdd upstream.

dev_set_drvdata() needs to be called before device_register()
exposes device to userspace. Otherwise kernel crashes after it
gets null pointer from dev_get_drvdata() when userspace tries
to access sysfs entries.

[Removed backtrace for length -- broonie]

Signed-off-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 178fcda..18d57c0 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -4054,13 +4054,13 @@ regulator_register(const struct regulator_desc *regulator_desc,
            !rdev->desc->fixed_uV)
                rdev->is_switch = true;
 
+       dev_set_drvdata(&rdev->dev, rdev);
        ret = device_register(&rdev->dev);
        if (ret != 0) {
                put_device(&rdev->dev);
                goto unset_supplies;
        }
 
-       dev_set_drvdata(&rdev->dev, rdev);
        rdev_init_debugfs(rdev);
 
        /* try to resolve regulators supply since a new one was registered */