4.9-stable review patch. If anyone has any objections, please let me know.
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From: Yu Zhao yuzhao@google.com
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
--- drivers/regulator/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -4054,13 +4054,13 @@ regulator_register(const struct regulato !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 */