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

JIRA: https://issues.redhat.com/browse/RHEL-110835

commit 46dc574
Author: Sivan Zohar-Kotzer <sivany32@gmail.com>
Date:   Wed Jul 2 01:13:55 2025 +0300

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

    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: eb82bac ("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: Steve Best <sbest@redhat.com>

Author: sfbest

drivers/powercap/dtpm_cpu.c

@@ -96,6 +96,8 @@ static u64 get_pd_power_uw(struct dtpm *dtpm)
 	int i;
 
 	pd = em_cpu_get(dtpm_cpu->cpu);
+	if (!pd)
+		return 0;
 
 	pd_mask = em_span_cpus(pd);