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powercap: call put_device() on an error path in powercap_register_control_type()

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powercap_register_control_type() calls device_register(), but does not
release the refcount of the device when it fails.

Call put_device() before returning an error to balance the refcount.

Since the kfree(control_type) will be done by powercap_release(), remove
the lines in powercap_register_control_type() before returning the error.

This bug was found by an experimental verifier that I am developing.

Signed-off-by: Joe Hattori <joe@pf.is.s.u-tokyo.ac.jp>
Link: https://patch.msgid.link/20250110010554.1583411-1-joe@pf.is.s.u-tokyo.ac.jp
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Joe Hattori 2025-01-10 10:05:54 +09:00 • committed by Rafael J. Wysocki
parent f4b9d3bf44
commit 93c66fbc28
1 changed files with 1 additions and 2 deletions
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3
drivers/powercap/powercap_sys.c
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@ -627,8 +627,7 @@ struct powercap_control_type *powercap_register_control_type(
dev_set_name(&control_type->dev, "%s", name);
result = device_register(&control_type->dev);
if (result) {
if (control_type->allocated)
kfree(control_type);
put_device(&control_type->dev);
return ERR_PTR(result);
}
idr_init(&control_type->idr);