linux-kernel - Re: [PATCH v3 6/7] tracing: Add snapshot action

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Date:   Fri, 10 Aug 2018 09:07:16 -0500
From:   Tom Zanussi <zanussi@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     rostedt@...dmis.org, tglx@...utronix.de, mhiramat@...nel.org,
        vedang.patel@...el.com, bigeasy@...utronix.de,
        joel@...lfernandes.org, mathieu.desnoyers@...icios.com,
        julia@...com, linux-kernel@...r.kernel.org,
        linux-rt-users@...r.kernel.org, kernel-team@....com
Subject: Re: [PATCH v3 6/7] tracing: Add snapshot action

On Fri, 2018-08-10 at 16:04 +0900, Namhyung Kim wrote:
> On Thu, Aug 09, 2018 at 09:34:16AM -0500, Tom Zanussi wrote:
> > From: Tom Zanussi <tom.zanussi@...ux.intel.com>
> > 
> > Add support for hist:handlerXXX($var).snapshot(), which will take a
> > snapshot of the current trace buffer whenever handlerXXX is hit.
> > 
> > As a first user, this also adds snapshot() action support for the
> > onmax() handler i.e. hist:onmax($var).snapshot().
> > 
> > Signed-off-by: Tom Zanussi <tom.zanussi@...ux.intel.com>
> > ---
> 
> [SNIP]
> > +static struct track_data *track_data_alloc(unsigned int key_len,
> > +					   struct action_data
> > *action_data,
> > +					   struct
> > hist_trigger_data *hist_data)
> > +{
> > +	struct track_data *data = kzalloc(sizeof(*data),
> > GFP_KERNEL);
> > +	unsigned int size = TASK_COMM_LEN;
> > +	struct hist_elt_data *elt_data;
> > +
> > +	if (!data)
> > +		return ERR_PTR(-ENOMEM);
> > +
> > +	data->key = kzalloc(key_len, GFP_KERNEL);
> > +	if (!data->key) {
> > +		track_data_free(data);
> > +		return ERR_PTR(-ENOMEM);
> > +	}
> > +
> > +	data->key_len = key_len;
> > +	data->action_data = action_data;
> > +	data->hist_data = hist_data;
> > +
> > +	elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
> > +	if (!elt_data) {
> > +		track_data_free(data);
> > +		return ERR_PTR(-ENOMEM);
> > +	}
> > +	elt_data->comm = kzalloc(size, GFP_KERNEL);
> > +	if (!elt_data->comm) {
> > +		track_data_free(data);
> 
> It seems to leak 'elf_data' here.
> 

Yep, it does - thanks for pointing that out.

Tom


> Thanks,
> Namhyung
> 
> 
> > +		return ERR_PTR(-ENOMEM);
> > +	}
> > +
> > +	data->elt.private_data = elt_data;
> > +
> > +	return data;
> > +}