linux-kernel - Re: [PATCH 01/14] tools lib traceevent: Get rid of malloc_or_die() in show

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Message-ID: <20131209183009.GC8098@ghostprotocols.net>
Date:	Mon, 9 Dec 2013 15:30:09 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH 01/14] tools lib traceevent: Get rid of malloc_or_die()
 in show_error()

Em Mon, Dec 09, 2013 at 02:33:58PM +0900, Namhyung Kim escreveu:
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/lib/traceevent/parse-filter.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c
> index 2500e75583fc..0fc905c230ad 100644
> --- a/tools/lib/traceevent/parse-filter.c
> +++ b/tools/lib/traceevent/parse-filter.c
> @@ -56,7 +56,21 @@ static void show_error(char **error_str, const char *fmt, ...)
>  	index = pevent_get_input_buf_ptr();
>  	len = input ? strlen(input) : 0;
>  
> -	error = malloc_or_die(MAX_ERR_STR_SIZE + (len*2) + 3);
> +	error = malloc(MAX_ERR_STR_SIZE + (len*2) + 3);
> +	if (error == NULL) {
> +		/*
> +		 * Maybe it's due to len is too long.
> +		 * Retry without the input buffer part.
> +		 */
> +		len = 0;
> +
> +		error = malloc(MAX_ERR_STR_SIZE);
> +		if (error == NULL) {
> +			/* no memory */
> +			*error_str = "failed to allocate memory";
> +			return;

Can *error_str point to either malloc'ed or constant strings? Who
releases the allocated memory?

- Arnaldo

> +		}
> +	}
>  
>  	if (len) {
>  		strcpy(error, input);
> -- 
> 1.7.11.7
--
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