netdev - Re: [PATCH net] tipc: check msg->req data len in tipc_nl_compat_bearer

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Message-ID: <CADvbK_dSghWbMtmpH+oMpW=0CsSU-usjQ=_nZw2qkgQ0iEuH+A@mail.gmail.com>
Date:   Tue, 25 Jun 2019 00:00:39 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, davem <davem@...emloft.net>,
        Jon Maloy <jon.maloy@...csson.com>,
        Ying Xue <ying.xue@...driver.com>,
        tipc-discussion@...ts.sourceforge.net,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: [PATCH net] tipc: check msg->req data len in tipc_nl_compat_bearer_disable

On Mon, Jun 24, 2019 at 4:33 PM Eric Dumazet <eric.dumazet@...il.com> wrote:
>
>
>
> On 6/24/19 12:59 AM, Xin Long wrote:
> > This patch is to fix an uninit-value issue, reported by syzbot:
> >
> >   BUG: KMSAN: uninit-value in memchr+0xce/0x110 lib/string.c:981
> >   Call Trace:
> >     __dump_stack lib/dump_stack.c:77 [inline]
> >     dump_stack+0x191/0x1f0 lib/dump_stack.c:113
> >     kmsan_report+0x130/0x2a0 mm/kmsan/kmsan.c:622
> >     __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:310
> >     memchr+0xce/0x110 lib/string.c:981
> >     string_is_valid net/tipc/netlink_compat.c:176 [inline]
> >     tipc_nl_compat_bearer_disable+0x2a1/0x480 net/tipc/netlink_compat.c:449
> >     __tipc_nl_compat_doit net/tipc/netlink_compat.c:327 [inline]
> >     tipc_nl_compat_doit+0x3ac/0xb00 net/tipc/netlink_compat.c:360
> >     tipc_nl_compat_handle net/tipc/netlink_compat.c:1178 [inline]
> >     tipc_nl_compat_recv+0x1b1b/0x27b0 net/tipc/netlink_compat.c:1281
> >
> > TLV_GET_DATA_LEN() may return a negtive int value, which will be
> > used as size_t (becoming a big unsigned long) passed into memchr,
> > cause this issue.
> >
> > Similar to what it does in tipc_nl_compat_bearer_enable(), this
> > fix is to return -EINVAL when TLV_GET_DATA_LEN() is negtive in
> > tipc_nl_compat_bearer_disable(), as well as in
> > tipc_nl_compat_link_stat_dump() and tipc_nl_compat_link_reset_stats().
> >
> > Reported-by: syzbot+30eaa8bf392f7fafffaf@...kaller.appspotmail.com
> > Signed-off-by: Xin Long <lucien.xin@...il.com>
>
> Please add an appropriate Fixes: tag, thanks !
>
Fixes: 0762216c0ad2 ("tipc: fix uninit-value in tipc_nl_compat_bearer_enable")
Fixes: 8b66fee7f8ee (:tipc: fix uninit-value in
tipc_nl_compat_link_reset_stats")

Sorry, David, do I need to resend this one?