From 4636a04630f632262e915f62deb59fa0f3ee5186 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 11 Mar 2020 09:02:06 +0100 Subject: [PATCH] drivers/base/cpu: Use scnprintf() for avoiding potential buffer overflow Since snprintf() returns the would-be-output size instead of the actual output size, the succeeding calls may go beyond the given buffer limit. Fix it by replacing with scnprintf(). Signed-off-by: Takashi Iwai Link: https://lore.kernel.org/r/20200311080207.12046-2-tiwai@suse.de Signed-off-by: Greg Kroah-Hartman --- drivers/base/cpu.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c index 6265871a4af2..67aaa052c7a2 100644 --- a/drivers/base/cpu.c +++ b/drivers/base/cpu.c @@ -258,13 +258,13 @@ static ssize_t print_cpus_offline(struct device *dev, buf[n++] = ','; if (nr_cpu_ids == total_cpus-1) - n += snprintf(&buf[n], len - n, "%u", nr_cpu_ids); + n += scnprintf(&buf[n], len - n, "%u", nr_cpu_ids); else - n += snprintf(&buf[n], len - n, "%u-%d", + n += scnprintf(&buf[n], len - n, "%u-%d", nr_cpu_ids, total_cpus-1); } - n += snprintf(&buf[n], len - n, "\n"); + n += scnprintf(&buf[n], len - n, "\n"); return n; } static DEVICE_ATTR(offline, 0444, print_cpus_offline, NULL); -- 2.20.1