This is a note to let you know that I've just added the patch titled
leds: do not overflow sysfs buffer in led_trigger_show
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
leds-do-not-overflow-sysfs-buffer-in-led_trigger_show.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3b9b95363c45365d606ad4bbba16acca75fdf6d3 Mon Sep 17 00:00:00 2001
From: Nathan Sullivan <nathan.sullivan@xxxxxx>
Date: Mon, 15 Aug 2016 17:20:14 -0500
Subject: leds: do not overflow sysfs buffer in led_trigger_show
From: Nathan Sullivan <nathan.sullivan@xxxxxx>
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@xxxxxx>
Signed-off-by: Zach Brown <zach.brown@xxxxxx>
Signed-off-by: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>
Cc: Willy Tarreau <w@xxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/leds/led-triggers.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -78,21 +78,23 @@ ssize_t led_trigger_show(struct device *
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);
Patches currently in stable-queue which might be from nathan.sullivan@xxxxxx are
queue-3.18/leds-do-not-overflow-sysfs-buffer-in-led_trigger_show.patch