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arm64: topology: fix possible overflow in amu_fie_setup()

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commit d4955c0ad77dbc684fc716387070ac24801b8bca upstream.

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: cd0ed03a89 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sergey Shtylyov
2022-09-16 23:17:07 +03:00
committed by Greg Kroah-Hartman
parent b5dc2f2578
commit 904f881b57
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kernel/topology.c
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@@ -158,7 +158,7 @@ static int validate_cpu_freq_invariance_counters(int cpu)
}
/* Convert maximum frequency from KHz to Hz and validate */
max_freq_hz = cpufreq_get_hw_max_freq(cpu) * 1000;
max_freq_hz = cpufreq_get_hw_max_freq(cpu) * 1000ULL;
if (unlikely(!max_freq_hz)) {
pr_debug("CPU%d: invalid maximum frequency.\n", cpu);
return -EINVAL;