From 9a2c61a921a8aeabacaccad0d2fdf75e1c1475fb Mon Sep 17 00:00:00 2001 From: Pavel Machek Date: Wed, 3 Dec 2008 08:43:48 +0000 Subject: [PATCH] backlight: Catch invalid input in sysfs attributes Check input properly in backlight, echo > brightness should not turn off the backlight. [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix printk warning] Signed-off-by: Pavel Machek Signed-off-by: Andrew Morton Signed-off-by: Richard Purdie --- drivers/video/backlight/backlight.c | 33 +++++++++++++---------------- 1 file changed, 15 insertions(+), 18 deletions(-) diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c index 0664fc032235..9593fdc042f7 100644 --- a/drivers/video/backlight/backlight.c +++ b/drivers/video/backlight/backlight.c @@ -80,20 +80,18 @@ static ssize_t backlight_show_power(struct device *dev, static ssize_t backlight_store_power(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - int rc = -ENXIO; - char *endp; + int rc; struct backlight_device *bd = to_backlight_device(dev); - int power = simple_strtoul(buf, &endp, 0); - size_t size = endp - buf; + unsigned long power; - if (*endp && isspace(*endp)) - size++; - if (size != count) - return -EINVAL; + rc = strict_strtoul(buf, 0, &power); + if (rc) + return rc; + rc = -ENXIO; mutex_lock(&bd->ops_lock); if (bd->ops) { - pr_debug("backlight: set power to %d\n", power); + pr_debug("backlight: set power to %lu\n", power); if (bd->props.power != power) { bd->props.power = power; backlight_update_status(bd); @@ -116,23 +114,22 @@ static ssize_t backlight_show_brightness(struct device *dev, static ssize_t backlight_store_brightness(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - int rc = -ENXIO; - char *endp; + int rc; struct backlight_device *bd = to_backlight_device(dev); - int brightness = simple_strtoul(buf, &endp, 0); - size_t size = endp - buf; + unsigned long brightness; + + rc = strict_strtoul(buf, 0, &brightness); + if (rc) + return rc; - if (*endp && isspace(*endp)) - size++; - if (size != count) - return -EINVAL; + rc = -ENXIO; mutex_lock(&bd->ops_lock); if (bd->ops) { if (brightness > bd->props.max_brightness) rc = -EINVAL; else { - pr_debug("backlight: set brightness to %d\n", + pr_debug("backlight: set brightness to %lu\n", brightness); if (bd->props.brightness != brightness) { bd->props.brightness = brightness; -- 2.39.2