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From: Benno Evers <bevers@mesosphere.io>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>
Cc: Benno Evers <bevers@mesosphere.com>,
	Krister Johansen <kjlx@templeofstupid.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	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 15:38:20 +0200
Message-ID: <d8d9132b-36af-951d-4932-42ec9fa1ae15@mesosphere.io> (raw)
In-Reply-To: <20180810131847.GG5395@kernel.org>

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@kernel.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@kernel.org>
> Signed-off-by: Benno Evers <bevers@mesosphere.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
>>>


      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
2018-08-10 13:18   ` Arnaldo Carvalho de Melo
2018-08-10 13:38     ` Benno Evers [this message]

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