The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Possible dependencies:
d4955c0ad77d ("arm64: topology: fix possible overflow in amu_fie_setup()") eec73529a932 ("arch_topology: Rename freq_scale as arch_freq_scale") a5f1b187cd24 ("arm64: topology: Make AMUs work with modular cpufreq drivers") 47b10b737c07 ("arm64: topology: Reorder init_amu_fie() a bit") 384e5699e101 ("arm64: topology: Avoid the have_policy check") 5ba836eb9fdb ("Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From d4955c0ad77dbc684fc716387070ac24801b8bca Mon Sep 17 00:00:00 2001 From: Sergey Shtylyov s.shtylyov@omp.ru Date: Fri, 16 Sep 2022 23:17:07 +0300 Subject: [PATCH] arm64: topology: fix possible overflow in amu_fie_setup()
cpufreq_get_hw_max_freq() returns max frequency in kHz as *unsigned int*, while freq_inv_set_max_ratio() gets passed this frequency in Hz as 'u64'. Multiplying max frequency by 1000 can potentially result in overflow -- multiplying by 1000ULL instead should avoid that...
Found by Linux Verification Center (linuxtesting.org) with the SVACE static analysis tool.
Fixes: cd0ed03a8903 ("arm64: use activity monitors for frequency invariance") Signed-off-by: Sergey Shtylyov s.shtylyov@omp.ru Link: https://lore.kernel.org/r/01493d64-2bce-d968-86dc-11a122a9c07d@omp.ru Signed-off-by: Will Deacon will@kernel.org
diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c index ad2bfc794257..44ebf5b2fc4b 100644 --- a/arch/arm64/kernel/topology.c +++ b/arch/arm64/kernel/topology.c @@ -237,7 +237,7 @@ static void amu_fie_setup(const struct cpumask *cpus) for_each_cpu(cpu, cpus) { if (!freq_counters_valid(cpu) || freq_inv_set_max_ratio(cpu, - cpufreq_get_hw_max_freq(cpu) * 1000, + cpufreq_get_hw_max_freq(cpu) * 1000ULL, arch_timer_get_rate())) return; }