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| author | Nathan Sullivan <nathan.sullivan@ni.com> | 2016-08-15 17:20:14 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-11 16:19:45 +0100 |
| commit | dff485e36287be123a844dc9164ba0417cd34552 (patch) | |
| tree | f35b08b4a1561505e9a035aa15cc50011c6556f7 | |
| parent | 6bde094049bf3648882ff8fdfabd7871f40d3935 (diff) | |
leds: do not overflow sysfs buffer in led_trigger_show
commit 3b9b95363c45365d606ad4bbba16acca75fdf6d3 upstream.
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>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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); |