Messages in this thread Patch in this message | | | Date | Fri, 21 Nov 2008 12:14:14 +0100 | From | Pavel Machek <> | Subject | backlight: catch invalid input |
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Currently, echo > brightness turns brightness to zero due to insufficient checking. Add a test to catch that.
Signed-off-by: Pavel Machek <pavel@suse.cz>
diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c index fab0bc8..5c2e23d 100644 --- a/drivers/video/backlight/backlight.c +++ b/drivers/video/backlight/backlight.c @@ -86,6 +86,8 @@ static ssize_t backlight_store_power(str int power = simple_strtoul(buf, &endp, 0); size_t size = endp - buf; + if (!size) + return -EINVAL; if (*endp && isspace(*endp)) size++; if (size != count)
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