Re: [PATCH] perf build-id: Fix filename size calculation

[Arnaldo Carvalho de Melo <acme@ghostprotocols.net>]

Em Tue, May 01, 2012 at 11:19:36PM +0900, Namhyung Kim escreveu:
> The filename is a pointer variable so the sizeof(filename) will return
> length of a pointer. Fix it by using 'size'.

Applied.

The code worked because the snprintf buffer size parameter would always
be bigger (negative) than the sbuild_id lenght, and all fitted in the
filename allocated space. :-)

- Arnaldo
 
> Signed-off-by: Namhyung Kim <namhyung@gmail.com>
> ---
>  tools/perf/util/header.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index 4c7c2d73251f..c0b70c697a36 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -296,7 +296,7 @@ int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
>  	if (mkdir_p(filename, 0755))
>  		goto out_free;
>  
> -	snprintf(filename + len, sizeof(filename) - len, "/%s", sbuild_id);
> +	snprintf(filename + len, size - len, "/%s", sbuild_id);
>  
>  	if (access(filename, F_OK)) {
>  		if (is_kallsyms) {
> -- 
> 1.7.9.2