linux-kernel - [PATCH 2/3] leds/class: Check snprintf return value

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1427706531-22569-1-git-send-email-ricardo.ribalda@gmail.com>
Date:	Mon, 30 Mar 2015 11:08:50 +0200
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Bryan Wu <cooloney@...il.com>, Richard Purdie <rpurdie@...ys.net>,
	linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH 2/3] leds/class: Check snprintf return value

If the final name does not fit the string there is a potential
endless-loop.

Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
 drivers/leds/led-class.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 294d6d6..2ffe8b1 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -223,12 +223,17 @@ static int led_classdev_next_name(const char *init_name, char *name,
 				  size_t len)
 {
 	int i = 0;
+	int ret = 0;
 
 	strlcpy(name, init_name, len);
 
-	while (class_find_device(leds_class, NULL, name, match_name))
+	while (class_find_device(leds_class, NULL, name, match_name) &&
+	       (ret < len))
 		snprintf(name, len, "%s_%d", init_name, ++i);
 
+	if (ret >= len)
+		return -ENOMEM;
+
 	return i;
 }
 
@@ -243,6 +248,9 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
 	int ret;
 
 	ret = led_classdev_next_name(led_cdev->name, name, sizeof(name));
+	if (ret < 0)
+		return ret;
+
 	led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
 				led_cdev, led_cdev->groups, "%s", name);
 	if (IS_ERR(led_cdev->dev))
-- 
2.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/