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

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[ Upstream commit 93c66fbc28 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Joe Hattori 2025-01-10 10:05:54 +09:00 • committed by Greg Kroah-Hartman

parent 54595d6e8b

commit 4a2ea3dd4e

1 changed files with 1 additions and 2 deletions

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drivers/powercap/powercap_sys.c

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