linux-kernel - Re: [PATCH] perf tools: Check for null when copying nsinfo.

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Message-ID: <20180810131847.GG5395@kernel.org>
Date:   Fri, 10 Aug 2018 10:18:47 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Benno Evers <bevers@...osphere.com>,
        Krister Johansen <kjlx@...pleofstupid.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        kernel-team@....com
Subject: Re: [PATCH] perf tools: Check for null when copying nsinfo.

Em Fri, Aug 10, 2018 at 01:55:37PM +0900, Namhyung Kim escreveu:
> Hello,
> 
> On Thu, Aug 09, 2018 at 11:53:48PM +0200, Benno Evers wrote:
> > The argument to nsinfo__copy() was assumed to be valid, but some code paths
> > exist that will lead to NULL being passed.
> > 
> > In particular, running 'perf script -D' on a perf.data file containing an
> > PERF_RECORD_MMAP event associating the '[vdso]' dso with pid 0 earlier in
> > the event stream will lead to a segfault.
> > 
> > Since all calling code is already checking for a non-null return value,
> > just return NULL for this case as well.
> 
> Acked-by: Namhyung Kim <namhyung@...nel.org>
> 
> It seems you missed the Signed-off-by though.

Yeah, please collect Namhyung's Acked-by and provide yours, i.e. your
patch should end with the following lines:


Acked-by: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Benno Evers <bevers@...osphere.com>

My git-am scripts will collect the Cc from the e-mail message and add
the Link:  with the Message-id.

Thanks,

- Arnaldo
 
> Thanks,
> Namhyung
> 
> 
> > ---
> >  tools/perf/util/namespaces.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/tools/perf/util/namespaces.c b/tools/perf/util/namespaces.c
> > index 5be021701f34..cf8bd123cf73 100644
> > --- a/tools/perf/util/namespaces.c
> > +++ b/tools/perf/util/namespaces.c
> > @@ -139,6 +139,9 @@ struct nsinfo *nsinfo__copy(struct nsinfo *nsi)
> >  {
> >  	struct nsinfo *nnsi;
> >  
> > +	if (nsi == NULL)
> > +		return NULL;
> > +
> >  	nnsi = calloc(1, sizeof(*nnsi));
> >  	if (nnsi != NULL) {
> >  		nnsi->pid = nsi->pid;
> > -- 
> > 2.17.1
> >