linux-kernel - Re: [PATCH v2] net: fix NULL pointer reference in cipso_v4_doi

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Message-ID: <20210830094525.3c97e460@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 30 Aug 2021 09:45:25 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Paul Moore <paul@...l-moore.com>
Cc:     王贇 <yun.wang@...ux.alibaba.com>,
        "David S. Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: fix NULL pointer reference in cipso_v4_doi_free

On Mon, 30 Aug 2021 10:17:05 -0400 Paul Moore wrote:
> On Mon, Aug 30, 2021 at 6:28 AM 王贇 <yun.wang@...ux.alibaba.com> wrote:
> >
> > In netlbl_cipsov4_add_std() when 'doi_def->map.std' alloc
> > failed, we sometime observe panic:
> >
> >   BUG: kernel NULL pointer dereference, address:
> >   ...
> >   RIP: 0010:cipso_v4_doi_free+0x3a/0x80
> >   ...
> >   Call Trace:
> >    netlbl_cipsov4_add_std+0xf4/0x8c0
> >    netlbl_cipsov4_add+0x13f/0x1b0
> >    genl_family_rcv_msg_doit.isra.15+0x132/0x170
> >    genl_rcv_msg+0x125/0x240
> >
> > This is because in cipso_v4_doi_free() there is no check
> > on 'doi_def->map.std' when doi_def->type got value 1, which
> > is possibe, since netlbl_cipsov4_add_std() haven't initialize
> > it before alloc 'doi_def->map.std'.
> >
> > This patch just add the check to prevent panic happen in similar
> > cases.
> >
> > Reported-by: Abaci <abaci@...ux.alibaba.com>
> > Signed-off-by: Michael Wang <yun.wang@...ux.alibaba.com>
> > ---
> >  net/netlabel/netlabel_cipso_v4.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)  
> 
> I see this was already merged, but it looks good to me, thanks for
> making those changes.

FWIW it looks like v1 was also merged:

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=733c99ee8b