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arm64: perf: Convert snprintf to sysfs_emit

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[ Upstream commit a5740e9555 ]

Use sysfs_emit instead of snprintf to avoid buf overrun,because in
sysfs_emit it strictly checks whether buf is null or buf whether
pagesize aligned, otherwise it returns an error.

Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Link: https://lore.kernel.org/r/1621497585-30887-1-git-send-email-tiantao6@hisilicon.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tian Tao 2021-05-20 15:59:45 +08:00 • committed by Greg Kroah-Hartman
commit d0214b841c
1 changed files with 1 additions and 1 deletions
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arch/arm64/kernel/perf_event.c
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@ -312,7 +312,7 @@ static ssize_t slots_show(struct device *dev, struct device_attribute *attr,
struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu);
u32 slots = cpu_pmu->reg_pmmir & ARMV8_PMU_SLOTS_MASK;
return snprintf(page, PAGE_SIZE, "0x%08x\n", slots);
return sysfs_emit(page, "0x%08x\n", slots);
}
static DEVICE_ATTR_RO(slots);