Hi, On 8/10/20 11:21 AM, kernel test robot wrote: > From: kernel test robot > > drivers/video/fbdev/core/fbcon.c:3509:8-16: WARNING: use scnprintf or sprintf > drivers/video/fbdev/core/fbcon.c:3484:8-16: WARNING: use scnprintf or sprintf > > > From Documentation/filesystems/sysfs.txt: > show() must not use snprintf() when formatting the value to be > returned to user space. If you can guarantee that an overflow > will never happen you can use sprintf() otherwise you must use > scnprintf(). > > Generated by: scripts/coccinelle/api/device_attr_show.cocci > > Fixes: abfc19ff202d ("coccinelle: api: add device_attr_show script") > CC: Denis Efremov > Signed-off-by: kernel test robot > --- > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > head: fc80c51fd4b23ec007e88d4c688f2cac1b8648e7 > commit: abfc19ff202d287742483e15fd478ddd6ada2187 coccinelle: api: add device_attr_show script > > Please take the patch only if it's a positive warning. Thanks! > > fbcon.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > --- a/drivers/video/fbdev/core/fbcon.c > +++ b/drivers/video/fbdev/core/fbcon.c > @@ -3481,7 +3481,7 @@ static ssize_t show_rotate(struct device > rotate = fbcon_get_rotate(info); > err: > console_unlock(); > - return snprintf(buf, PAGE_SIZE, "%d\n", rotate); > + return scnprintf(buf, PAGE_SIZE, "%d\n", rotate); buf length is at least PAGE_SIZE and rotate val is an int so shouldn't this be converted to use sprintf() instead? > } > > static ssize_t show_cursor_blink(struct device *device, > @@ -3506,7 +3506,7 @@ static ssize_t show_cursor_blink(struct > blink = (ops->flags & FBCON_FLAGS_CURSOR_TIMER) ? 1 : 0; > err: > console_unlock(); > - return snprintf(buf, PAGE_SIZE, "%d\n", blink); > + return scnprintf(buf, PAGE_SIZE, "%d\n", blink); ditto for blink val > } > > static ssize_t store_cursor_blink(struct device *device, > Best regards, -- Bartlomiej Zolnierkiewicz Samsung R&D Institute Poland Samsung Electronics