[lvc-project] [PATCH 5.10.y] arm64: topology: fix possible overflow in amu_fie_setup()

[Sergey Shtylyov]

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: cd0ed03a8903 ("arm64: use activity monitors for frequency invariance")
Signed-off-by: Sergey Shtylyov <s.shtylyov at omp.ru>
Link: https://lore.kernel.org/r/01493d64-2bce-d968-86dc-11a122a9c07d@omp.ru
Signed-off-by: Will Deacon <will at kernel.org>

---
 arch/arm64/kernel/topology.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-stable/arch/arm64/kernel/topology.c
===================================================================
--- linux-stable.orig/arch/arm64/kernel/topology.c
+++ linux-stable/arch/arm64/kernel/topology.c
@@ -158,7 +158,7 @@ static int validate_cpu_freq_invariance_
 	}
 
 	/* 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;