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lib: sbi_pmu: Avoid out of bounds access

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On a misconfigured system we could access phs->active_events[] out of
bounds. Check that num_hw_ctrs is less or equal SBI_PMU_HW_CTR_MAX.

Addresses-Coverity-ID: 1566113 ("Out-of-bounds read")
Addresses-Coverity-ID: 1566114 ("Out-of-bounds write")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Heinrich Schuchardt 2023-07-03 15:43:18 +02:00 • committed by Anup Patel
parent 0907de38db
commit eb736a5118
1 changed files with 2 additions and 0 deletions
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lib/sbi/sbi_pmu.c
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@ -933,6 +933,8 @@ int sbi_pmu_init(struct sbi_scratch *scratch, bool cold_boot)
/* mcycle & minstret is available always */
num_hw_ctrs = sbi_hart_mhpm_count(scratch) + 3;
if (num_hw_ctrs > SBI_PMU_HW_CTR_MAX)
return SBI_EINVAL;
total_ctrs = num_hw_ctrs + SBI_PMU_FW_CTR_MAX;
}