diff options
| author | Nathan Sullivan <nathan.sullivan@ni.com> | 2016-08-15 17:20:14 -0500 |
|---|---|---|
| committer | Sasha Levin <alexander.levin@microsoft.com> | 2018-03-20 23:49:47 -0400 |
| commit | e7874854f5d7a5249cd8b2b54e0bb654cd79d33d (patch) | |
| tree | 10bf377cf04ace06051467c1d3193b588deda50c /drivers | |
| parent | d24741b2854ef83e9f4318067548714804ca42a4 (diff) | |
leds: do not overflow sysfs buffer in led_trigger_show
[ Upstream commit 3b9b95363c45365d606ad4bbba16acca75fdf6d3 ]
Per the documentation, use scnprintf instead of sprintf to ensure there
is never more than PAGE_SIZE bytes of trigger names put into the
buffer.
Signed-off-by: Nathan Sullivan <nathan.sullivan@ni.com>
Signed-off-by: Zach Brown <zach.brown@ni.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/leds/led-triggers.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c index e8b1120f486d..eef3e64ca0a8 100644 --- a/drivers/leds/led-triggers.c +++ b/drivers/leds/led-triggers.c @@ -88,21 +88,23 @@ ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr, down_read(&led_cdev->trigger_lock); if (!led_cdev->trigger) - len += sprintf(buf+len, "[none] "); + len += scnprintf(buf+len, PAGE_SIZE - len, "[none] "); else - len += sprintf(buf+len, "none "); + len += scnprintf(buf+len, PAGE_SIZE - len, "none "); list_for_each_entry(trig, &trigger_list, next_trig) { if (led_cdev->trigger && !strcmp(led_cdev->trigger->name, trig->name)) - len += sprintf(buf+len, "[%s] ", trig->name); + len += scnprintf(buf+len, PAGE_SIZE - len, "[%s] ", + trig->name); else - len += sprintf(buf+len, "%s ", trig->name); + len += scnprintf(buf+len, PAGE_SIZE - len, "%s ", + trig->name); } up_read(&led_cdev->trigger_lock); up_read(&triggers_list_lock); - len += sprintf(len+buf, "\n"); + len += scnprintf(len+buf, PAGE_SIZE - len, "\n"); return len; } EXPORT_SYMBOL_GPL(led_trigger_show); |