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cpufreq: prevent NULL dereference in cpufreq_online()

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Ensure cpufreq_driver->set_boost is non-NULL before using it in
cpufreq_online() to prevent a potential NULL pointer dereference.

Reported-by: Gautam Menghani <gautam@linux.ibm.com>
Closes: https://lore.kernel.org/all/c9e56c5f54cc33338762c94e9bed7b5a0d5de812.camel@linux.ibm.com/
Fixes: dd016f379e ("cpufreq: Introduce a more generic way to set default per-policy boost flag")
Suggested-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Aboorva Devarajan <aboorvad@linux.ibm.com>
Link: https://patch.msgid.link/20250205181347.2079272-1-aboorvad@linux.ibm.com
[ rjw: Minor edits in the subject and changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Aboorva Devarajan 2025-02-05 23:43:47 +05:30 • committed by Rafael J. Wysocki
parent 90508a1bb8
commit 0813fd2e14
1 changed files with 2 additions and 1 deletions
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3
drivers/cpufreq/cpufreq.c
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@ -1571,7 +1571,8 @@ static int cpufreq_online(unsigned int cpu)
policy->cdev = of_cpufreq_cooling_register(policy);
/* Let the per-policy boost flag mirror the cpufreq_driver boost during init */
if (policy->boost_enabled != cpufreq_boost_enabled()) {
if (cpufreq_driver->set_boost &&
policy->boost_enabled != cpufreq_boost_enabled()) {
policy->boost_enabled = cpufreq_boost_enabled();
ret = cpufreq_driver->set_boost(policy, policy->boost_enabled);
if (ret) {