All of lore.kernel.org
 help / color / mirror / Atom feed
* [PATCH] kconfig: remove 'const' from the return type of sym_escape_string()
@ 2021-09-27 12:59 Masahiro Yamada
  2021-09-28 10:04 ` Nicolas Schier
  0 siblings, 1 reply; 2+ messages in thread
From: Masahiro Yamada @ 2021-09-27 12:59 UTC (permalink / raw)
  To: linux-kbuild; +Cc: Masahiro Yamada, linux-kernel

sym_escape_string() returns a malloc'ed memory, so it must be freed
when it is done.

Currently, sym_escape_string() returns the malloc'ed memory as
(const char *), then it is casted to (void *) when it is passed to
free(). This is odd.

The return type of sym_escape_string() should be (char *).

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

 scripts/kconfig/conf.c      | 10 +++++-----
 scripts/kconfig/confdata.c  |  8 ++++----
 scripts/kconfig/lkc_proto.h |  2 +-
 scripts/kconfig/symbol.c    |  3 ++-
 4 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index a6dad4a2e7a2..d8e1994bfed0 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -647,15 +647,15 @@ static void check_conf(struct menu *menu)
 		switch (input_mode) {
 		case listnewconfig:
 			if (sym->name) {
-				const char *str;
-
 				if (sym->type == S_STRING) {
+					char *str;
+
 					str = sym_escape_string(sym);
 					printf("%s%s=%s\n", CONFIG_, sym->name, str);
-					free((void *)str);
+					free(str);
 				} else {
-					str = sym_get_string_value(sym);
-					printf("%s%s=%s\n", CONFIG_, sym->name, str);
+					printf("%s%s=%s\n", CONFIG_, sym->name,
+					       sym_get_string_value(sym));
 				}
 			}
 			break;
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 4e053f2477f9..f7eac4beb128 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -728,7 +728,7 @@ static struct conf_printer header_printer_cb =
 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 			      struct conf_printer *printer, void *printer_arg)
 {
-	const char *str;
+	char *str;
 
 	switch (sym->type) {
 	case S_UNKNOWN:
@@ -736,11 +736,11 @@ static void conf_write_symbol(FILE *fp, struct symbol *sym,
 	case S_STRING:
 		str = sym_escape_string(sym);
 		printer->print_symbol(fp, sym, str, printer_arg);
-		free((void *)str);
+		free(str);
 		break;
 	default:
-		str = sym_get_string_value(sym);
-		printer->print_symbol(fp, sym, str, printer_arg);
+		printer->print_symbol(fp, sym, sym_get_string_value(sym),
+				      printer_arg);
 	}
 }
 
diff --git a/scripts/kconfig/lkc_proto.h b/scripts/kconfig/lkc_proto.h
index 035cc522808b..7ce4b666bba8 100644
--- a/scripts/kconfig/lkc_proto.h
+++ b/scripts/kconfig/lkc_proto.h
@@ -18,7 +18,7 @@ extern struct symbol * symbol_hash[SYMBOL_HASHSIZE];
 
 struct symbol * sym_lookup(const char *name, int flags);
 struct symbol * sym_find(const char *name);
-const char * sym_escape_string(struct symbol *sym);
+char *sym_escape_string(struct symbol *sym);
 struct symbol ** sym_re_search(const char *pattern);
 const char * sym_type_name(enum symbol_type type);
 void sym_calc_value(struct symbol *sym);
diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index 4a31bb943f79..57189a1ad797 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -871,7 +871,8 @@ struct symbol *sym_find(const char *name)
 	return symbol;
 }
 
-const char *sym_escape_string(struct symbol *sym)
+/* the returned pointer must be freed on the caller side */
+char *sym_escape_string(struct symbol *sym)
 {
 	const char *in, *p;
 	size_t reslen;
-- 
2.30.2


^ permalink raw reply related	[flat|nested] 2+ messages in thread

* Re: [PATCH] kconfig: remove 'const' from the return type of sym_escape_string()
  2021-09-27 12:59 [PATCH] kconfig: remove 'const' from the return type of sym_escape_string() Masahiro Yamada
@ 2021-09-28 10:04 ` Nicolas Schier
  0 siblings, 0 replies; 2+ messages in thread
From: Nicolas Schier @ 2021-09-28 10:04 UTC (permalink / raw)
  To: Masahiro Yamada; +Cc: linux-kbuild, linux-kernel

On Mon, Sep 27, 2021 at 09:59:44PM +0900, Masahiro Yamada wrote:
> sym_escape_string() returns a malloc'ed memory, so it must be freed
> when it is done.
> 
> Currently, sym_escape_string() returns the malloc'ed memory as
> (const char *), then it is casted to (void *) when it is passed to
> free(). This is odd.
> 
> The return type of sym_escape_string() should be (char *).
> 
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

Reviewed-by: Nicolas Schier <n.schier@avm.de>

> ---
> 
>  scripts/kconfig/conf.c      | 10 +++++-----
>  scripts/kconfig/confdata.c  |  8 ++++----
>  scripts/kconfig/lkc_proto.h |  2 +-
>  scripts/kconfig/symbol.c    |  3 ++-
>  4 files changed, 12 insertions(+), 11 deletions(-)
> 
> diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
> index a6dad4a2e7a2..d8e1994bfed0 100644
> --- a/scripts/kconfig/conf.c
> +++ b/scripts/kconfig/conf.c
> @@ -647,15 +647,15 @@ static void check_conf(struct menu *menu)
>  		switch (input_mode) {
>  		case listnewconfig:
>  			if (sym->name) {
> -				const char *str;
> -
>  				if (sym->type == S_STRING) {
> +					char *str;
> +
>  					str = sym_escape_string(sym);
>  					printf("%s%s=%s\n", CONFIG_, sym->name, str);
> -					free((void *)str);
> +					free(str);
>  				} else {
> -					str = sym_get_string_value(sym);
> -					printf("%s%s=%s\n", CONFIG_, sym->name, str);
> +					printf("%s%s=%s\n", CONFIG_, sym->name,
> +					       sym_get_string_value(sym));
>  				}
>  			}
>  			break;
> diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
> index 4e053f2477f9..f7eac4beb128 100644
> --- a/scripts/kconfig/confdata.c
> +++ b/scripts/kconfig/confdata.c
> @@ -728,7 +728,7 @@ static struct conf_printer header_printer_cb =
>  static void conf_write_symbol(FILE *fp, struct symbol *sym,
>  			      struct conf_printer *printer, void *printer_arg)
>  {
> -	const char *str;
> +	char *str;
>  
>  	switch (sym->type) {
>  	case S_UNKNOWN:
> @@ -736,11 +736,11 @@ static void conf_write_symbol(FILE *fp, struct symbol *sym,
>  	case S_STRING:
>  		str = sym_escape_string(sym);
>  		printer->print_symbol(fp, sym, str, printer_arg);
> -		free((void *)str);
> +		free(str);
>  		break;
>  	default:
> -		str = sym_get_string_value(sym);
> -		printer->print_symbol(fp, sym, str, printer_arg);
> +		printer->print_symbol(fp, sym, sym_get_string_value(sym),
> +				      printer_arg);
>  	}
>  }
>  
> diff --git a/scripts/kconfig/lkc_proto.h b/scripts/kconfig/lkc_proto.h
> index 035cc522808b..7ce4b666bba8 100644
> --- a/scripts/kconfig/lkc_proto.h
> +++ b/scripts/kconfig/lkc_proto.h
> @@ -18,7 +18,7 @@ extern struct symbol * symbol_hash[SYMBOL_HASHSIZE];
>  
>  struct symbol * sym_lookup(const char *name, int flags);
>  struct symbol * sym_find(const char *name);
> -const char * sym_escape_string(struct symbol *sym);
> +char *sym_escape_string(struct symbol *sym);
>  struct symbol ** sym_re_search(const char *pattern);
>  const char * sym_type_name(enum symbol_type type);
>  void sym_calc_value(struct symbol *sym);
> diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
> index 4a31bb943f79..57189a1ad797 100644
> --- a/scripts/kconfig/symbol.c
> +++ b/scripts/kconfig/symbol.c
> @@ -871,7 +871,8 @@ struct symbol *sym_find(const char *name)
>  	return symbol;
>  }
>  
> -const char *sym_escape_string(struct symbol *sym)
> +/* the returned pointer must be freed on the caller side */
> +char *sym_escape_string(struct symbol *sym)
>  {
>  	const char *in, *p;
>  	size_t reslen;
> -- 
> 2.30.2
> 


^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, other threads:[~2021-09-28 10:04 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-09-27 12:59 [PATCH] kconfig: remove 'const' from the return type of sym_escape_string() Masahiro Yamada
2021-09-28 10:04 ` Nicolas Schier

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.