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[2a02:8389:2240:6380:b418:985e:6bb5:99d0]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b6f0c6db6sm172913175e9.2.2025.08.30.07.44.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 30 Aug 2025 07:44:47 -0700 (PDT) From: Dennis Beier To: rafael@kernel.org, viresh.kumar@linaro.org Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Dennis Beier Subject: [PATCH v2] cpufreq/longhaul: handle NULL policy in longhaul_exit Date: Sat, 30 Aug 2025 16:43:59 +0200 Message-ID: <20250830144431.159893-1-nanovim@gmail.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- drivers/cpufreq/longhaul.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/cpufreq/longhaul.c b/drivers/cpufreq/longhaul.c index ba0e08c8486a..49e76b44468a 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 =3D cpufreq_cpu_get(0); int i; =20 + if (unlikely(!policy)) + return; + for (i =3D 0; i < numscales; i++) { if (mults[i] =3D=3D maxmult) { struct cpufreq_freqs freqs; --=20 2.51.0