On Fri, 2015-08-21 at 11:53 +0300, Dan Carpenter wrote: > The limit should be "PAGE_SIZE - len" instead of PAGE_SIZE. > Besides that was in the original code, the problem still might happen when FB_BACKLIGHT_LEVELS is set to 171+ since snprintf() returns desired length. I suppose you would change this to check len on each iteration or change to scnprintf() if I get it correct. > diff --git a/drivers/video/fbdev/core/fbsysfs.c > b/drivers/video/fbdev/core/fbsysfs.c > index 60c3f0a..827098d 100644 > --- a/drivers/video/fbdev/core/fbsysfs.c > +++ b/drivers/video/fbdev/core/fbsysfs.c > @@ -485,7 +485,7 @@ static ssize_t show_bl_curve(struct device > *device, > > mutex_lock(&fb_info->bl_curve_mutex); > for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8) > - len += snprintf(&buf[len], PAGE_SIZE, "%8ph\n", > + len += snprintf(&buf[len], PAGE_SIZE - len, > "%8ph\n", > fb_info->bl_curve + i); > mutex_unlock(&fb_info->bl_curve_mutex); > -- Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Intel Finland Oy -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
