Re: [Buildroot] [PATCH 1/1] support/kconfig: fix compiler warnings

[Arnout Vandecappelle <arnout@mind.be>]

On 22/09/2021 16:08, Edgar Bonet wrote:
> Compiling on Ubuntu 20.04 generates this:
> 
> ./util.c: In function ‘file_write_dep’
> ./util.c:54:18: warning: ‘..config.tmp’ directive writing 12 bytes into a region of size between 1 and 4097 [-Wformat-overflow=]
>     54 |  sprintf(buf, "%s..config.tmp", dir);
>        |                  ^~~~~~~~~~~~
> ./util.c:54:2: note: ‘sprintf’ output between 13 and 4109 bytes into a destination of size 4097
>     54 |  sprintf(buf, "%s..config.tmp", dir);
>        |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> and similar warnings on confdata.c, lines 778, 989, 995, 1000, 1007,
> 1040, 1046 and 1054. Avoid the warnings by enlarging the destination
> buffer of fprintf().
> 
> Signed-off-by: Edgar Bonet <bonet@grenoble.cnrs.fr>
> ---
>   support/kconfig/confdata.c | 4 ++--
>   support/kconfig/util.c     | 2 +-
>   2 files changed, 3 insertions(+), 3 deletions(-)

  Normally, when we make changes to the kconfig sources, we want to keep track 
of that with patches in support/kconfig/patches. This allows us to track 
upstream without loosing the modifications we make.

  However, in this case, upstream has already heavily modified those files, and 
fixed the issues. So we there's no need to keep it as patches.

  Therefore, applied to master, with an updated commit message that explains the 
above, thanks.

  Regards,
  Arnout

> 
> diff --git a/support/kconfig/confdata.c b/support/kconfig/confdata.c
> index 892da74fdc..9ab980edd8 100644
> --- a/support/kconfig/confdata.c
> +++ b/support/kconfig/confdata.c
> @@ -744,7 +744,7 @@ int conf_write(const char *name)
>   	struct menu *menu;
>   	const char *basename;
>   	const char *str;
> -	char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
> +	char dirname[PATH_MAX+1], tmpname[PATH_MAX+20], newname[PATH_MAX+1];
>   	char *env;
>   
>   	if (!name)
> @@ -974,7 +974,7 @@ int conf_write_autoconf(void)
>   	const char *name;
>   	FILE *out, *tristate, *out_h;
>   	int i;
> -	char dir[PATH_MAX+1], buf[PATH_MAX+1];
> +	char dir[PATH_MAX+1], buf[PATH_MAX+20];
>   	char *s;
>   
>   	strcpy(dir, conf_get_configname());
> diff --git a/support/kconfig/util.c b/support/kconfig/util.c
> index 18a8e52391..8665f5bb89 100644
> --- a/support/kconfig/util.c
> +++ b/support/kconfig/util.c
> @@ -35,7 +35,7 @@ struct file *file_lookup(const char *name)
>   int file_write_dep(const char *name)
>   {
>   	char *str;
> -	char buf[PATH_MAX+1], buf2[PATH_MAX+1], dir[PATH_MAX+1];
> +	char buf[PATH_MAX+20], buf2[PATH_MAX+1], dir[PATH_MAX+1];
>   	struct symbol *sym, *env_sym;
>   	struct expr *e;
>   	struct file *file;
> 
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