Re: [PATCH v2] xenpmd.c: use dynamic allocation

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Tue, Jan 26, 2021 at 11:48:00PM +0100, Manuel Bouyer wrote:
> On NetBSD, d_name is larger than 256, so file_name[284] may not be large
> enough (and gcc emits a format-truncation error).
> Use asprintf() instead of snprintf() on a static on-stack buffer.
> 
> Signed-off-by: Manuel Bouyer <bouyer@xxxxxxxxxx>

Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

> ---
>  tools/xenpmd/xenpmd.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/xenpmd/xenpmd.c b/tools/xenpmd/xenpmd.c
> index 12b82cf43e..e432aad856 100644
> --- a/tools/xenpmd/xenpmd.c
> +++ b/tools/xenpmd/xenpmd.c
> @@ -101,7 +101,7 @@ FILE *get_next_battery_file(DIR *battery_dir,
>  {
>      FILE *file = 0;
>      struct dirent *dir_entries;
> -    char file_name[284];
> +    char *file_name;
>      int ret;
>      
>      do 
> @@ -112,16 +112,16 @@ FILE *get_next_battery_file(DIR *battery_dir,
>          if ( strlen(dir_entries->d_name) < 4 )
>              continue;
>          if ( battery_info_type == BIF ) 
> -            ret = snprintf(file_name, sizeof(file_name), 
> BATTERY_INFO_FILE_PATH,
> +            ret = asprintf(&file_name, BATTERY_INFO_FILE_PATH,
>                       dir_entries->d_name);
>          else 
> -            ret = snprintf(file_name, sizeof(file_name), 
> BATTERY_STATE_FILE_PATH,
> +            ret = asprintf(&file_name, BATTERY_STATE_FILE_PATH,
>                       dir_entries->d_name);
>          /* This should not happen but is needed to pass gcc checks */
>          if (ret < 0)
>              continue;
> -        file_name[sizeof(file_name) - 1] = '\0';
>          file = fopen(file_name, "r");
> +     free(file_name);

Hard tab. May I ask whether this can be fixed on commit so that
there's no need to resend a new version?

Thanks, Roger.