[BUG] net_cls: Panic occured when net_cls subsystem use

[Jarek Poplawski]

On Sat, May 30, 2009 at 07:13:14PM -0400, jamal wrote:
> On Sun, 2009-05-31 at 07:22 +0900, Minoru Usui wrote:
> 
> > I'll do it after understanding above code.
> 
> Current patch has two places with:
> 
> +               if (n->nlmsg_type == RTM_NEWTFILTER &&
> +                   (n->nlmsg_flags&NLM_F_CREATE)) {
> 
> The change (in the two spots) is:
> +               if (n->nlmsg_type == RTM_NEWTFILTER &&
> +                   (n->nlmsg_flags&(NLM_F_CREATE|NLM_F_EXCL))) {
> 

Sorry, but I don't think this change is enough; tc filter replace
with only this (n->nlmsg_type == RTM_NEWTFILTER &&
(n->nlmsg_flags&(NLM_F_CREATE))) can get here with an "old" tp
and will relink it or destroy depending on the ->change() return.

Cheers,
Jarek P.