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From: Namhyung Kim <namhyung@kernel.org>
To: Benno Evers <bevers@mesosphere.com>
Cc: Krister Johansen <kjlx@templeofstupid.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>,
	linux-kernel@vger.kernel.org, kernel-team@lge.com
Subject: Re: [PATCH] perf tools: Check for null when copying nsinfo.
Date: Fri, 10 Aug 2018 13:55:37 +0900
Message-ID: <20180810045537.GA479@sejong> (raw)
In-Reply-To: <20180809215349.24299-1-bevers@mesosphere.com>

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@kernel.org>

It seems you missed the Signed-off-by though.

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
> 

  reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-09 21:53 Benno Evers
2018-08-10  4:55 ` Namhyung Kim [this message]
2018-08-10 13:18   ` Arnaldo Carvalho de Melo
2018-08-10 13:38     ` Benno Evers

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