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authorNathan Sullivan <nathan.sullivan@ni.com>2016-08-16 01:20:14 +0300
committerJacek Anaszewski <j.anaszewski@samsung.com>2016-08-16 22:34:30 +0300
commit3b9b95363c45365d606ad4bbba16acca75fdf6d3 (patch)
tree6ef4e80e14ad3eec71611883e4cd034c74aa651d /drivers/leds/led-triggers.c
parent50237863c4edd9c342b522d8edfedf23b20d4a21 (diff)
downloadlinux-3b9b95363c45365d606ad4bbba16acca75fdf6d3.tar.xz
leds: do not overflow sysfs buffer in led_trigger_show
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>
Diffstat (limited to 'drivers/leds/led-triggers.c')
-rw-r--r--drivers/leds/led-triggers.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index f0b3d101994b..59d6a3e58a3d 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -81,21 +81,23 @@ 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);