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

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Date:   Fri, 10 Aug 2018 15:38:20 +0200
From:   Benno Evers <bevers@...osphere.io>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        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.

Haha, sorry, I was following some "how-to-contribute" guide out there, 
but it seems like I missed a step :D I sent out a new version with the 
missing sign-off.


On 10.08.2018 15:18, Arnaldo Carvalho de Melo wrote:
> 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
>>>