linux-kernel - Re: [PATCH perf/core v2 5/8] perf header: Make topology checkers to check return value of strbuf

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Date:	Thu, 5 May 2016 20:55:18 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <mhiramat@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH perf/core v2 5/8] perf header: Make topology checkers to
 check return value of strbuf

Em Sat, Apr 30, 2016 at 12:10:33AM +0900, Masami Hiramatsu escreveu:
> Make topology checkers to check the return value of strbuf
> APIs so that it can detect errors in it.

>  	}
> @@ -1907,7 +1910,7 @@ static int process_numa_topology(struct perf_file_section *section __maybe_unuse
>  	u32 nr, node, i;
>  	char *str;
>  	uint64_t mem_total, mem_free;
> -	struct strbuf sb;
> +	struct strbuf sb = STRBUF_INIT;

Since you're going to call strbuf_init() later, is the above really
needed?
  
>  	/* nr nodes */
>  	ret = readn(fd, &nr, sizeof(nr));
> @@ -1918,7 +1921,8 @@ static int process_numa_topology(struct perf_file_section *section __maybe_unuse
>  		nr = bswap_32(nr);
>  
>  	ph->env.nr_numa_nodes = nr;
> -	strbuf_init(&sb, 256);
> +	if (strbuf_init(&sb, 256) < 0)
> +		goto error;
>