linux-kernel - Re: [PATCH] perf probe: fix module name matching

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Message-Id: <20160805211729.c0358de5d225f09050c57bbc@kernel.org>
Date:	Fri, 5 Aug 2016 21:17:29 +0900
From:	Masami Hiramatsu <mhiramat@...nel.org>
To:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [PATCH] perf probe: fix module name matching

On Fri, 05 Aug 2016 12:41:03 +0300
Konstantin Khlebnikov <khlebnikov@...dex-team.ru> wrote:

> If module is "module" then dso->short_name is "[module]".
> Substring comparing is't enough: "raid10" matches to "[raid1]".
> This patch also checks terminating zero in module name.

Right, just one comment on this patch.

> 
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
> ---
>  tools/perf/util/probe-event.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index 953dc1ab2ed7..c27b7aca4a6d 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -170,8 +170,10 @@ static struct map *kernel_get_module_map(const char *module)
>  		module = "kernel";
>  
>  	for (pos = maps__first(maps); pos; pos = map__next(pos)) {
> +		/* short_name is "[module]" */
>  		if (strncmp(pos->dso->short_name + 1, module,
> -			    pos->dso->short_name_len - 2) == 0) {
> +			    pos->dso->short_name_len - 2) == 0 &&
> +		    module[pos->dso->short_name_len - 2] == 0) {

Here, please use '\0' instead of 0, because "module" should points a null
terminated string.

Thanks,

>  			return pos;
>  		}
>  	}
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>