On Jan 6, 2016, at 7:53 AM, Insu Yun <wuninsu@xxxxxxxxx> wrote: > > Return value of snprintf is not bound by size value, 2nd argument. > (https://www.kernel.org/doc/htmldocs/kernel-api/API-snprintf.html). > Return value is number of printed chars, can be larger than 2nd argument. > Therefore, it can write null byte out of bounds ofbuffer. > Since snprintf puts null, it does not need to put additional null byte. > > Signed-off-by: Insu Yun <wuninsu@xxxxxxxxx> > --- > drivers/scsi/ipr.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c > index 536cd5a..caf63f9 100644 > --- a/drivers/scsi/ipr.c > +++ b/drivers/scsi/ipr.c > @@ -4003,13 +4003,12 @@ static ssize_t ipr_store_update_fw(struct device *dev, > struct ipr_sglist *sglist; > char fname[100]; > char *src; > - int len, result, dnld_size; > + int result, dnld_size; > > if (!capable(CAP_SYS_ADMIN)) > return -EACCES; > > - len = snprintf(fname, 99, "%s", buf); > - fname[len-1] = '\0'; > + snprintf(fname, 99, "%s", buf); Changing the 99 to sizeof(fname) as part of this change would also make for cleaner code in my opinion. Will leave it up to you if you'd like to do a v3. Reviewed-by: Matthew R. Ochs <mrochs@xxxxxxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
