From: Dennis Beier <nanovim@gmail.com>
Date: Sat, 30 Aug 2025 14:43:59 +0000 (+0200)
Subject: cpufreq/longhaul: handle NULL policy in longhaul_exit
X-Git-Tag: v6.18-rc1~49^2^2~2^2~5
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=592532a77b736b5153e0c2e4c74aa50af0a352ab;p=thirdparty%2Fkernel%2Flinux.git

cpufreq/longhaul: handle NULL policy in longhaul_exit

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 <nanovim@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---

diff --git a/drivers/cpufreq/longhaul.c b/drivers/cpufreq/longhaul.c
index ba0e08c8486a6..49e76b44468aa 100644
--- a/drivers/cpufreq/longhaul.c
+++ b/drivers/cpufreq/longhaul.c
@@ -953,6 +953,9 @@ 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;