Re: [patch -master] netfilter: xt_CT: checking for IS_ERR() instead of NULL

[Pablo Neira Ayuso <pablo@netfilter.org>]

On Mon, Aug 03, 2015 at 11:30:16AM -0700, Joe Stringer wrote:
> On 3 August 2015 at 11:29, Joe Stringer <joestringer@nicira.com> wrote:
> > On 30 July 2015 at 04:57, Pablo Neira Ayuso <pablo@netfilter.org> wrote:
> >> On Tue, Jul 28, 2015 at 01:42:28AM +0300, Dan Carpenter wrote:
> >>> We recently changed this from nf_conntrack_alloc() to nf_ct_tmpl_alloc()
> >>> so the error handling needs to changed to check for NULL instead of
> >>> IS_ERR().
> >>>
> >>> Fixes: 0838aa7fcfcd ('netfilter: fix netns dependencies with conntrack templates')
> >>> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> >>
> >> Applied, thanks.
> >>
> >> I have also appended this chunk, since synproxy is also affected:
> >>
> >> --- a/net/netfilter/nf_synproxy_core.c
> >> +++ b/net/netfilter/nf_synproxy_core.c
> >> @@ -353,7 +353,7 @@ static int __net_init synproxy_net_init(struct net *net)
> >>         int err = -ENOMEM;
> >>
> >>         ct = nf_ct_tmpl_alloc(net, 0, GFP_KERNEL);
> >> -       if (IS_ERR(ct)) {
> >> +       if (!ct) {
> >>                 err = PTR_ERR(ct);
> >>                 goto err1;
> >>         }
> >
> > Does PTR_ERR() implicitly interpret NULL as -ENOMEM? Seems like the
> > fix applied here is a little different from the xt_CT fix.
> 
> Just saw the initialization of err now, but this would be overridden
> within the error checking statement.

Right, I noticed before pushing out this change, the final applied
patch is here:

http://git.kernel.org/cgit/linux/kernel/git/pablo/nf.git/commit/?id\x1a727c63612fc582370cf3dc01239d3d239743b5

Let me know if you still have any concern, thanks Joe.