netdev - Re: [PATCH bpf] tools: bpf: fix NULL return handling in bpf__prepare

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Date:   Tue, 15 May 2018 11:11:43 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     YueHaibing <yuehaibing@...wei.com>,
        alexander.shishkin@...ux.intel.com, mingo@...hat.com,
        peterz@...radead.org, netdev@...r.kernel.org, namhyung@...nel.org
Subject: Re: [PATCH bpf] tools: bpf: fix NULL return handling in
 bpf__prepare_load

Em Sun, May 13, 2018 at 01:20:22AM +0200, Daniel Borkmann escreveu:
> [ +Arnaldo ]
> 
> On 05/11/2018 01:21 PM, YueHaibing wrote:
> > bpf_object__open()/bpf_object__open_buffer can return error pointer or NULL,
> > check the return values with IS_ERR_OR_NULL() in bpf__prepare_load and
> > bpf__prepare_load_buffer
> > 
> > Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> > ---
> >  tools/perf/util/bpf-loader.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> This should probably be routed via Arnaldo due to the fix in perf itself. If
> there's no particular preference on which tree, we could potentially route it
> as well via bpf with Acked-by from Arnaldo, but that is up to him. Arnaldo,
> any preference?

I'm preparing a pull req right now, and working a bit on perf's BPF
support, so why not, I'll merge it, thanks,

- Arnaldo
 
> > diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
> > index af7ad81..cee6587 100644
> > --- a/tools/perf/util/bpf-loader.c
> > +++ b/tools/perf/util/bpf-loader.c
> > @@ -66,7 +66,7 @@ bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
> >  	}
> >  
> >  	obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, name);
> > -	if (IS_ERR(obj)) {
> > +	if (IS_ERR_OR_NULL(obj)) {
> >  		pr_debug("bpf: failed to load buffer\n");
> >  		return ERR_PTR(-EINVAL);
> >  	}
> > @@ -102,14 +102,14 @@ struct bpf_object *bpf__prepare_load(const char *filename, bool source)
> >  			pr_debug("bpf: successfull builtin compilation\n");
> >  		obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, filename);
> >  
> > -		if (!IS_ERR(obj) && llvm_param.dump_obj)
> > +		if (!IS_ERR_OR_NULL(obj) && llvm_param.dump_obj)
> >  			llvm__dump_obj(filename, obj_buf, obj_buf_sz);
> >  
> >  		free(obj_buf);
> >  	} else
> >  		obj = bpf_object__open(filename);
> >  
> > -	if (IS_ERR(obj)) {
> > +	if (IS_ERR_OR_NULL(obj)) {
> >  		pr_debug("bpf: failed to load %s\n", filename);
> >  		return obj;
> >  	}
> >