Re: net/mptcp/pm_netlink.c:1169 mptcp_pm_parse_pm_addr_attr() warn: missing error code? 'err'

Chen, Rong A
2022-12-06T10:43:45Z

On 12/3/2022 4:29 PM, Dan Carpenter wrote:
> On Fri, Dec 02, 2022 at 03:38:01PM -0800, Mat Martineau wrote:
>>> 01cacb00b35cb6 Paolo Abeni 2020-03-27 1158 /* no validation needed - was already done via nested policy */
>>> 01cacb00b35cb6 Paolo Abeni 2020-03-27 1159 err = nla_parse_nested_deprecated(tb, MPTCP_PM_ADDR_ATTR_MAX, attr,
>>> 01cacb00b35cb6 Paolo Abeni 2020-03-27 1160 mptcp_pm_addr_policy, info->extack);
>>> 01cacb00b35cb6 Paolo Abeni 2020-03-27 1161 if (err)
>>> 01cacb00b35cb6 Paolo Abeni 2020-03-27 1162 return err;
>>> 01cacb00b35cb6 Paolo Abeni 2020-03-27 1163
>>> 982f17ba1a2534 Florian Westphal 2022-05-03 1164 if (tb[MPTCP_PM_ADDR_ATTR_ID])
>>> 982f17ba1a2534 Florian Westphal 2022-05-03 1165 addr->id = nla_get_u8(tb[MPTCP_PM_ADDR_ATTR_ID]);
>>> 982f17ba1a2534 Florian Westphal 2022-05-03 1166
>>> 01cacb00b35cb6 Paolo Abeni 2020-03-27 1167 if (!tb[MPTCP_PM_ADDR_ATTR_FAMILY]) {
>>> 01cacb00b35cb6 Paolo Abeni 2020-03-27 1168 if (!require_family)
>>> 982f17ba1a2534 Florian Westphal 2022-05-03 @1169 return err;
>>>
>>> "err" is zero at this point. Presumably a negative error code was
>>> intended.
>>
>> Hi Dan -
>>
>> The intended error code is 0 here: the return happens if no
>> MPTCP_PM_ADDR_ATTR_FAMILY value is present and require_family is false.
>>
>> It would be clearer to "return 0;", but the code is working as expected.
>>
>>
>> Could you be sure to cc mptcp@lists.linux.dev and
>> matthieu.baerts@tessares.net for future MPTCP issues?

Hi Mat,

Sorry for the delay, we'll cc you and the mailing list in the future.

Best Regards,
Rong Chen

>
> These emails are automatically generated by the kbuild team. I don't
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>
> regards,
> dan carpenter
>
>