[ovs-dev] [PATCH] ofproto-dpif-upcall: Fix using uninitialized upcall hash.
Ilya Maximets
i.maximets at ovn.org
Tue Jan 7 15:32:48 UTC 2020
On 06.01.2020 21:27, William Tu wrote:
> On Sat, Jan 04, 2020 at 11:16:27AM +0800, Tonghao Zhang wrote:
>> On Sat, Jan 4, 2020 at 8:16 AM Ilya Maximets <i.maximets at ovn.org> wrote:
>>>
>>> upcalls are allocated on stack and 'hash' field must be initialized
>>> regardless of attribute existence because it will be used later.
>>>
>>> Conditional jump or move depends on uninitialised value(s)
>>> at 0xFA74A7: dpif_netlink_encode_execute (dpif-netlink.c:1828)
>>> by 0xFA6DE8: dpif_netlink_operate__ (dpif-netlink.c:1906)
>>> by 0xFA612F: dpif_netlink_operate_chunks (dpif-netlink.c:2219)
>>> by 0xFA0E36: dpif_netlink_operate (dpif-netlink.c:2275)
>>> by 0xE5AFAC: dpif_operate (dpif.c:1376)
>>> by 0xDF3922: handle_upcalls (ofproto-dpif-upcall.c:1615)
>>> by 0xDF269B: recv_upcalls (ofproto-dpif-upcall.c:857)
>>> by 0xDF1C49: udpif_upcall_handler (ofproto-dpif-upcall.c:759)
>>> by 0xF3A3FE: ovsthread_wrapper (ovs-thread.c:383)
>>> by 0x565F6DA: start_thread (pthread_create.c:463)
>>> by 0x615988E: clone (clone.S:95)
>>> Uninitialised value was created by a stack allocation
>>> at 0xDF2258: recv_upcalls (ofproto-dpif-upcall.c:773)
>>>
>>> Fixes: 0442bfb11d6c ("ofproto-dpif-upcall: Echo HASH attribute back to datapath.")
>>> Signed-off-by: Ilya Maximets <i.maximets at ovn.org>
>>> ---
>>> ofproto/ofproto-dpif-upcall.c | 4 +++-
>>> 1 file changed, 3 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/ofproto/ofproto-dpif-upcall.c b/ofproto/ofproto-dpif-upcall.c
>>> index aac0554af..409286ab1 100644
>>> --- a/ofproto/ofproto-dpif-upcall.c
>>> +++ b/ofproto/ofproto-dpif-upcall.c
>>> @@ -786,6 +786,7 @@ recv_upcalls(struct handler *handler)
>>> struct upcall *upcall = &upcalls[n_upcalls];
>>> struct flow *flow = &flows[n_upcalls];
>>> unsigned int mru = 0;
>>> + uint64_t hash = 0;
>>> int error;
>>>
>>> ofpbuf_use_stub(recv_buf, recv_stubs[n_upcalls],
>>> @@ -806,7 +807,7 @@ recv_upcalls(struct handler *handler)
>>> }
>>>
>>> if (dupcall->hash) {
>>> - upcall->hash = nl_attr_get_u64(dupcall->hash);
>>> + hash = nl_attr_get_u64(dupcall->hash);
>>> }
>>>
>>> error = upcall_receive(upcall, udpif->backer, &dupcall->packet,
>>> @@ -830,6 +831,7 @@ recv_upcalls(struct handler *handler)
>>> upcall->key = dupcall->key;
>>> upcall->key_len = dupcall->key_len;
>>> upcall->ufid = &dupcall->ufid;
>>> + upcall->hash = hash;
>>>
>>> upcall->out_tun_key = dupcall->out_tun_key;
>>> upcall->actions = dupcall->actions;
>>> --
>>> 2.17.1
>>>
>> Acked-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
>
> Looks good to me.
> Acked-by: William Tu <u9012063 at gmail.com>
Thanks! Applied to master.
Best regards, Ilya Maximets.
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