[BUG] net_cls: Panic occured when net_cls subsystem use

[Minoru Usui]

Hi, jamal

2009/5/30 jamal <hadi at cyberus.ca>
>
> On Sat, 2009-05-30 at 14:45 +0200, Jarek Poplawski wrote:
> > On Sat, May 30, 2009 at 08:31:23AM -0400, jamal wrote:
>
> > > Remeber, you could have NLM_F_EXCL|NLM_F_CREATE to indicate "create this
> > > thing if it doesnt exist; if it exists  it is an error"
> > > If it doesnt exist we will enter that (tp == NULL) path
> > > also fh will be 0 ==> So you will never enter the code
> > > path you are refering to.
> > > If it exists (i.e you found it) and you enter the code path you refer
> > > to, then you surely dont want to destroy it if NLM_F_EXCL is set.
> >
> > I mean we don't want to link it again or destroy after ->change() err
> > if we run replace (n->nlmsg_type == RTM_NEWTFILTER &&
> > (n->nlmsg_flags&NLM_F_CREATE)).
>
> excellent point: an additional flag is needed then
> n->nlmsg_flags& (NLM_F_CREATE|NLM_F_EXCL).
> Minoru, please add this change in the patch before testing...

OK.
I'll do it after understanding above code.