linux-kernel - Re: [PATCH v4 15/16] perf tools: add feature header record to pipe-mode

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Date:   Tue, 13 Jun 2017 20:54:45 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     David Carrillo-Cisneros <davidcc@...gle.com>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>, Simon Que <sque@...omium.org>,
        Wang Nan <wangnan0@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
        He Kuang <hekuang@...wei.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH v4 15/16] perf tools: add feature header record to
 pipe-mode

On Mon, Jun 12, 2017 at 09:29:31PM -0700, David Carrillo-Cisneros wrote:

SNIP

> +
> +	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
> +		if (!feat_ops[feat].synthesize) {
> +			pr_debug("No record header feature for header :%d\n", feat);
> +			continue;
> +		}
> +
> +		ff.offset = sizeof(*fe);
> +
> +		ret = feat_ops[feat].write(&ff, evlist);
> +		if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
> +			pr_debug("Error writing feature\n");
> +			continue;
> +		}
> +
> +		/* ff.buf may have changed due to realloc in do_write() */
> +		fe = ff.buf;
> +		memset(fe, 0, sizeof(*fe));
> +
> +		fe->feat_id = feat;
> +		fe->header.type = PERF_RECORD_HEADER_FEATURE;
> +		fe->header.size = ff.offset;
> +
> +		ret = process(tool, ff.buf, NULL, NULL);
> +		if (ret)

leaking ff.buf

jirka

> +			return ret;
> +	}
> +	free(ff.buf);
> +	return 0;
> +}
> +