From 956b56d17a89775e4957bbddefa45cd3c6c71000 Mon Sep 17 00:00:00 2001 From: Dennis Beier Date: Sat, 30 Aug 2025 16:43:59 +0200 Subject: cpufreq/longhaul: handle NULL policy in longhaul_exit [ Upstream commit 592532a77b736b5153e0c2e4c74aa50af0a352ab ] longhaul_exit() was calling cpufreq_cpu_get(0) without checking for a NULL policy pointer. On some systems, this could lead to a NULL dereference and a kernel warning or panic. This patch adds a check using unlikely() and returns early if the policy is NULL. Bugzilla: #219962 Signed-off-by: Dennis Beier Signed-off-by: Viresh Kumar Signed-off-by: Sasha Levin --- drivers/cpufreq/longhaul.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/cpufreq/longhaul.c b/drivers/cpufreq/longhaul.c index 182a4dbca095..7197b0daabea 100644 --- a/drivers/cpufreq/longhaul.c +++ b/drivers/cpufreq/longhaul.c @@ -955,6 +955,9 @@ static void __exit longhaul_exit(void) struct cpufreq_policy *policy = cpufreq_cpu_get(0); int i; + if (unlikely(!policy)) + return; + for (i = 0; i < numscales; i++) { if (mults[i] == maxmult) { struct cpufreq_freqs freqs; -- cgit v1.2.3