linux-kernel - Re: [PATCH 2/2] net: cipso: fix memory leak in cipso_v4_doi

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Message-ID: <CAD-N9QURhZ-YpspgbJ+BcPPZ6fYoba7-dQ+yHu7LH74ttm6uSw@mail.gmail.com>
Date:   Sat, 10 Jul 2021 15:42:37 +0800
From:   Dongliang Mu <mudongliangabcd@...il.com>
To:     Pavel Skripkin <paskripkin@...il.com>
Cc:     Paul Moore <paul@...l-moore.com>,
        "David S. Miller" <davem@...emloft.net>, yoshfuji@...ux-ipv6.org,
        dsahern@...nel.org, Jakub Kicinski <kuba@...nel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        linux-security-module@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] net: cipso: fix memory leak in cipso_v4_doi_free

On Sat, Jul 10, 2021 at 3:41 PM Pavel Skripkin <paskripkin@...il.com> wrote:
>
> On Sat, 10 Jul 2021 15:29:19 +0800
> Dongliang Mu <mudongliangabcd@...il.com> wrote:
>
> > On Sat, Jul 10, 2021 at 3:10 PM Pavel Skripkin <paskripkin@...il.com>
> > wrote:
> > >
> > > When doi_def->type == CIPSO_V4_MAP_TRANS doi_def->map.std should
> > > be freed to avoid memory leak.
> > >
> > > Fail log:
> > >
> > > BUG: memory leak
> > > unreferenced object 0xffff88801b936d00 (size 64):
> > > comm "a.out", pid 8478, jiffies 4295042353 (age 15.260s)
> > > hex dump (first 32 bytes):
> > > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
> > > 00 00 00 00 15 b8 12 26 00 00 00 00 00 00 00 00  .......&........
> > > backtrace:
> > > netlbl_cipsov4_add (net/netlabel/netlabel_cipso_v4.c:145
> > > net/netlabel/netlabel_cipso_v4.c:416) genl_family_rcv_msg_doit
> > > (net/netlink/genetlink.c:741) genl_rcv_msg
> > > (net/netlink/genetlink.c:783 net/netlink/genetlink.c:800)
> > > netlink_rcv_skb (net/netlink/af_netlink.c:2505) genl_rcv
> > > (net/netlink/genetlink.c:813)
> > >
> > > Fixes: b1edeb102397 ("netlabel: Replace protocol/NetLabel linking
> > > with refrerence counts")
> > > Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
> > > ---
> > >  net/ipv4/cipso_ipv4.c | 1 +
> > >  1 file changed, 1 insertion(+)
> > >
> > > diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
> > > index bfaf327e9d12..e0480c6cebaa 100644
> > > --- a/net/ipv4/cipso_ipv4.c
> > > +++ b/net/ipv4/cipso_ipv4.c
> > > @@ -472,6 +472,7 @@ void cipso_v4_doi_free(struct cipso_v4_doi
> > > *doi_def) kfree(doi_def->map.std->lvl.local);
> > >                 kfree(doi_def->map.std->cat.cipso);
> > >                 kfree(doi_def->map.std->cat.local);
> > > +               kfree(doi_def->map.std);
> > >                 break;
> > >         }
> > >         kfree(doi_def);
> > > --
> >
> > Hi Paval,
> >
> > this patch is already merged by Paul. See [1] for more details.
> >
> > [1]
> > https://lore.kernel.org/netdev/CAHC9VhQZVOmy7n14nTSRGHzwN-y=E_JTUP+NpRCgD8rJN5sOGA@mail.gmail.com/T/
> >
>
>
> Hi, Dongliang!
>
> Thank you for the information. I'm wondering, can maintainer pick only 1
> patch from series, or I should send v2?

I don't know. Maybe you can wait for the reply of the maintainers.

>
>
>
> With regards,
> Pavel Skripkin