linux-kernel - Re: [PATCH] staging: most: protect potential string overflow

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Date:   Fri, 26 Apr 2019 11:44:50 +0800
From:   Bo YU <tsu.yubo@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Kroah-Hartman <gregkh@...uxfoundation.org>,
        christian.gromm@...rochip.com,
        Colin King <colin.king@...onical.com>, andrey.shvetsov@....de,
        "open list:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: most: protect potential string overflow

On Wed, Apr 24, 2019 at 10:55 PM Dan Carpenter <dan.carpenter@...cle.com> wrote:
>
> On Mon, Apr 22, 2019 at 10:20:18PM -0400, Bo YU wrote:
> > There maybe cause potential string overflow issue due to use
> > strcpy without checking the length
> >
> > Detected By CoversityScan CID# 1444760
> >
> > Fixes: 131ac62253dba:(staging: most: core: use device description as name)
>
> It doesn't really fix anything, it just silences a static checker
> warning.
>
> > Signed-off-by: Bo YU <tsu.yubo@...il.com>
> > ---
> >  drivers/staging/most/core.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/staging/most/core.c b/drivers/staging/most/core.c
> > index 956daf8c3bd2..0f26cebac91a 100644
> > --- a/drivers/staging/most/core.c
> > +++ b/drivers/staging/most/core.c
> > @@ -1431,7 +1431,7 @@ int most_register_interface(struct most_interface *iface)
> >
> >       INIT_LIST_HEAD(&iface->p->channel_list);
> >       iface->p->dev_id = id;
> > -     strcpy(iface->p->name, iface->description);
> > +     strlcpy(iface->p->name, iface->description, sizeof(iface->p->name));
>
> We prefer strscpy() more than strlcpy() these days.

 Ok,will try it.
 Thanks,

>
> regards,
> dan carpenter
>