4.20-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 754a58db6a556e6e5f5e32f3e84e7d67b5bf9c8e ]
devm_kasprintf() may return NULL on failure of internal allocation thus the assignment to 'name' is not safe if unchecked. If NULL is passed in for name then perf_pmu_register() would not fail but rather silently jump to skip_type which is not the intent here. As perf_pmu_register() may also return -ENOMEM returning -ENOMEM in the (unlikely) failure case of devm_kasprintf() should be fine here as well.
Acked-by: Mark Rutland mark.rutland@arm.com Fixes: d5d9696b0380 ("drivers/perf: Add support for ARMv8.2 Statistical Profiling Extension") Signed-off-by: Nicholas Mc Guire hofrat@osadl.org [will: reworded error message] Signed-off-by: Will Deacon will.deacon@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/perf/arm_spe_pmu.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/perf/arm_spe_pmu.c b/drivers/perf/arm_spe_pmu.c index 54ec278d2fc4..e1a77b2de78a 100644 --- a/drivers/perf/arm_spe_pmu.c +++ b/drivers/perf/arm_spe_pmu.c @@ -927,6 +927,11 @@ static int arm_spe_pmu_perf_init(struct arm_spe_pmu *spe_pmu)
idx = atomic_inc_return(&pmu_idx); name = devm_kasprintf(dev, GFP_KERNEL, "%s_%d", PMUNAME, idx); + if (!name) { + dev_err(dev, "failed to allocate name for pmu %d\n", idx); + return -ENOMEM; + } + return perf_pmu_register(&spe_pmu->pmu, name, -1); }