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

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Date:   Fri, 10 Aug 2018 16:04:04 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Tom Zanussi <zanussi@...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 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.

Thanks,
Namhyung


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