linux-kernel - Re: [PATCH] perf script: avoid null dereference on symbol

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Message-ID: <CAP-5=fVBZTxTzjb8bW-x5rEPaOM7srxsNOdDaEB3nbERxMud0A@mail.gmail.com>
Date:   Wed, 22 Apr 2020 08:35:24 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf script: avoid null dereference on symbol

On Wed, Apr 22, 2020 at 6:59 AM Arnaldo Carvalho de Melo
<arnaldo.melo@...il.com> wrote:
>
> Em Wed, Apr 22, 2020 at 10:20:16AM +0200, Jiri Olsa escreveu:
> > On Mon, Apr 20, 2020 at 05:43:29PM -0700, Ian Rogers wrote:
> > > al->sym may be null given current if conditions and may cause a segv.
> > >
> > > Fixes: cd2bedb7863e9 (perf script: Allow --symbol to accept hexadecimal addresses)
> >
> > seems it's wrong commit number, I see it under d2bedb7863e9
>
> Thanks, added your Acked-by, I noticed the wrong commit number, fixed it
> up to the same you point above.

Thanks for fixing the commit number, I'll try to figure out why I'm
calculating these incorrectly.

Ian

> - Arnaldo
>
> >
> > > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > > ---
> > >  tools/perf/util/event.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
> > > index dc0e11214ae1..f581550a3015 100644
> > > --- a/tools/perf/util/event.c
> > > +++ b/tools/perf/util/event.c
> > > @@ -626,7 +626,7 @@ int machine__resolve(struct machine *machine, struct addr_location *al,
> > >                     ret = strlist__has_entry(symbol_conf.sym_list,
> > >                                             al->sym->name);
> > >             }
> > > -           if (!(ret && al->sym)) {
> > > +           if (!ret && al->sym) {
> >
> > Acked-by: Jiri Olsa <jolsa@...hat.com>
> >
> > thanks,
> > jirka
> >
> > >                     snprintf(al_addr_str, sz, "0x%"PRIx64,
> > >                             al->map->unmap_ip(al->map, al->sym->start));
> > >                     ret = strlist__has_entry(symbol_conf.sym_list,
> > > --
> > > 2.26.1.301.g55bc3eb7cb9-goog
> > >
> >
>
> --
>
> - Arnaldo