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 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
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-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 3b9b95363c45365d606ad4bbba16acca75fdf6d3 Mon Sep 17 00:00:00 2001
From: Nathan Sullivan nathan.sullivan@ni.com 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@ni.com
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
--- 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 @@ -88,21 +88,23 @@ 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@ni.com are
queue-4.4/leds-do-not-overflow-sysfs-buffer-in-led_trigger_show.patch