linux-kernel - Re: [PATCH -tip v2 1/2] [CLEANUP] perf-probe: Expand given path to absolute path

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Date:	Thu, 26 Dec 2013 09:14:46 -0500
From:	David Ahern <dsahern@...il.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"David A. Long" <dave.long@...aro.org>, systemtap@...rceware.org,
	yrl.pp-manager.tt@...achi.com, Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH -tip v2 1/2] [CLEANUP] perf-probe: Expand given path to
 absolute path

On 12/26/13, 12:41 AM, Masami Hiramatsu wrote:
> @@ -180,7 +181,20 @@ static int opt_set_target(const struct option *opt, const char *str,
>   		else
>   			return ret;
>
> -		params.target = str;
> +		/* Expand given path to absolute path, except for modulename */
> +		if (params.uprobes || strchr(str, '/')) {
> +			tmp = realpath(str, NULL);
> +			if (!tmp) {
> +				pr_warning("Failed to find the path of %s.\n",
> +					   str);

That error message will be misleading if it is generated. How about:
     Failed to get the absolute path of %s: %d\n", str, errno.

> +				return ret;
> +			}
> +		} else {
> +			tmp = strdup(str);
> +			if (!tmp)
> +				return -ENOMEM;
> +		}
> +		params.target = tmp;

When is params.target freed?

David

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