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perf: RISC-V: Limit the number of counters returned from SBI

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Perf gets the number of supported counters from SBI. If it happens that
the number of returned counters more than RISCV_MAX_COUNTERS the code
trusts it. It does not lead to an immediate problem but can potentially
lead to it. Prevent getting more than RISCV_MAX_COUNTERS from SBI.

Signed-off-by: Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20230505072058.1049732-1-v.v.mitrofanov@yadro.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Viacheslav Mitrofanov 2023-05-05 07:20:57 +00:00 committed by Palmer Dabbelt
parent 4681dacade
commit ee95b88d71
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1 changed files with 6 additions and 0 deletions
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6
drivers/perf/riscv_pmu_sbi.c
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@ -855,6 +855,12 @@ static int pmu_sbi_device_probe(struct platform_device *pdev)
goto out_free;
}
/* It is possible to get from SBI more than max number of counters */
if (num_counters > RISCV_MAX_COUNTERS) {
num_counters = RISCV_MAX_COUNTERS;
pr_info("SBI returned more than maximum number of counters. Limiting the number of counters to %d\n", num_counters);
}
/* cache all the information about counters now */
if (pmu_sbi_get_ctrinfo(num_counters, &cmask))
goto out_free;