Commit a5740e95 authored by Tian Tao's avatar Tian Tao Committed by Will Deacon
Browse files

arm64: perf: Convert snprintf to sysfs_emit 



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: default avatarTian Tao <tiantao6@hisilicon.com>
Link: https://lore.kernel.org/r/1621497585-30887-1-git-send-email-tiantao6@hisilicon.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent fdbef8c4

arch/arm64/kernel/perf_event.c

+1 −1
Original line number Diff line number Diff line
@@ -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);