linux-kernel - Re: [PATCH] jffs2: free jffs2_sb_info through jffs2_kill

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Message-ID: <CAFLxGvw+=gfrm3SH4Hu9bt0sa6s+X=3cCjkDLvWusqhHH10yEQ@mail.gmail.com>
Date:   Tue, 16 Oct 2018 08:41:02 +0200
From:   Richard Weinberger <richard.weinberger@...il.com>
To:     houtao1@...wei.com
Cc:     "linux-mtd @ lists . infradead . org" <linux-mtd@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw2@...radead.org>, stable@...nel.org,
        Arnd Bergmann <arnd@...db.de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Brian Norris <computersforpeace@...il.com>
Subject: Re: [PATCH] jffs2: free jffs2_sb_info through jffs2_kill_sb()

On Tue, Oct 16, 2018 at 7:53 AM Hou Tao <houtao1@...wei.com> wrote:
>
> ping ?
>
> On 2018/10/6 17:09, Hou Tao wrote:
> > When an invalid mount option is passed to jffs2, jffs2_parse_options()
> > will fail and jffs2_sb_info will be freed, but then jffs2_sb_info will
> > be used (use-after-free) and freeed (double-free) in jffs2_kill_sb().
> >
> > Fix it by removing the buggy invocation of kfree() when getting invalid
> > mount options.
> >
> > Cc: stable@...nel.org
> > Signed-off-by: Hou Tao <houtao1@...wei.com>
> > ---
> >  fs/jffs2/super.c | 4 +---
> >  1 file changed, 1 insertion(+), 3 deletions(-)
> >
> > diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
> > index 87bdf0f4cba1..902a7dd10e5c 100644
> > --- a/fs/jffs2/super.c
> > +++ b/fs/jffs2/super.c
> > @@ -285,10 +285,8 @@ static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
> >       sb->s_fs_info = c;
> >
> >       ret = jffs2_parse_options(c, data);
> > -     if (ret) {
> > -             kfree(c);
> > +     if (ret)
> >               return -EINVAL;
> > -     }

Reviewed-by: Richard Weinberger <richard@....at>

We can carry this via the MTD tree.

-- 
Thanks,
//richard