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Date:   Fri, 31 Jul 2020 20:08:05 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     davem@...emloft.net, kuba@...nel.org, ast@...nel.org,
        jolsa@...nel.org, netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: pull-request: bpf 2020-07-31

On Fri, Jul 31, 2020 at 06:12:48PM +0200, Daniel Borkmann wrote:

SNIP

> > >                  return -EINVAL;
> > >          return id;
> > > }
> > > 
> > > Let me know if you run into any others issues (CC'ing Jiri Olsa so he's in
> > > the loop with regards to merge conflict resolution).
> > 
> > we'll loose the bpf_log message, but I'm fine with that ;-) looks good
> 
> Checking again on the fix, even though it was only triggered by syzkaller
> so far, I think it's also possible if users don't have BTF debug data set
> in the Kconfig but use a helper that expects it, so agree, lets re-add the
> log in this case:
> 
> int btf_resolve_helper_id(struct bpf_verifier_log *log,
>                           const struct bpf_func_proto *fn, int arg)
> {
>         int id;
> 
>         if (fn->arg_type[arg] != ARG_PTR_TO_BTF_ID)
>                 return -EINVAL;
>         if (!btf_vmlinux) {
>                 bpf_log(log, "btf_vmlinux doesn't exist\n");
>                 return -EINVAL;
>         }
>         id = fn->btf_id[arg];
>         if (!id || id > btf_vmlinux->nr_types)
>                 return -EINVAL;
>         return id;
> }

ok, looks good
jirka

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