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Sivan Zohar-Kotzer 2fd001a007 powercap: dtpm_cpu: Fix NULL pointer dereference in get_pd_power_uw()

[ Upstream commit 46dc574068 ]

The get_pd_power_uw() function can crash with a NULL pointer dereference
when em_cpu_get() returns NULL. This occurs when a CPU becomes impossible
during runtime, causing get_cpu_device() to return NULL, which propagates
through em_cpu_get() and leads to a crash when em_span_cpus() dereferences
the NULL pointer.

Add a NULL check after em_cpu_get() and return 0 if unavailable,
matching the existing fallback behavior in __dtpm_cpu_setup().

Fixes: eb82bace89 ("powercap/drivers/dtpm: Scale the power with the load")
Signed-off-by: Sivan Zohar-Kotzer <sivany32@gmail.com>
Link: https://patch.msgid.link/20250701221355.96916-1-sivany32@gmail.com
[ rjw: Drop an excess empty code line ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2025-08-15 16:38:31 +02:00

arm_scmi_powercap.c

powercap: arm_scmi: Remove recursion while parsing zones

2023-07-20 20:27:10 +02:00

dtpm_cpu.c

powercap: dtpm_cpu: Fix NULL pointer dereference in get_pd_power_uw()

2025-08-15 16:38:31 +02:00

dtpm_devfreq.c

powercap: dtpm_devfreq: Fix error check against dev_pm_qos_add_request()

2024-10-21 13:23:06 +02:00

dtpm_subsys.h

powercap/drivers/dtpm: Add dtpm devfreq with energy model support