[PATCH] arm64: perf: Convert snprintf to sysfs_emit
STALE1949d
LANDED
From: Tian Tao <tiantao6@hisilicon.com>
Date: 2021-05-20 08:01:53
Also in:
linux-perf-users
Subsystem:
arm pmu profiling and debugging, arm64 port (aarch64 architecture), performance events subsystem, the rest · Maintainers:
Will Deacon, Mark Rutland, Catalin Marinas, Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
Landed in mainline as a5740e955540 on 2021-06-01.
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> --- arch/arm64/kernel/perf_event.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index f594957..44b6eda 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c@@ -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);
--
2.7.4
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