linux-kernel - [PATCH AUTOSEL 4.20 098/304] perf: arm_spe: handle devm

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Date:   Mon, 28 Jan 2019 10:40:15 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nicholas Mc Guire <hofrat@...dl.org>,
        Will Deacon <will.deacon@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.20 098/304] perf: arm_spe: handle devm_kasprintf() failure

From: Nicholas Mc Guire <hofrat@...dl.org>

[ 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@....com>
Fixes: d5d9696b0380 ("drivers/perf: Add support for ARMv8.2 Statistical Profiling Extension")
Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
[will: reworded error message]
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Sasha Levin <sashal@...nel.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);
 }
 
-- 
2.19.1