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

[Chen, Rong A]

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@xxxxxxxxxxxxxxx and
> > matthieu.baerts@xxxxxxxxxxxx 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
> know what kind of heuristics they use...  I've put them on the To
> header.  There is probably a reason why they don't just use
> get_maintainer.pl...
>
> regards,
> dan carpenter