[v2,2/2] coredump: add __printf attribute to cn_*printf functions
diff mbox

Message ID 1431656975-3563-2-git-send-email-nicolas.iooss_linux@m4x.org
State New
Headers show

Commit Message

Nicolas Iooss May 15, 2015, 2:29 a.m. UTC
This allows detecting improper format string at build time, like:

  fs/coredump.c:225:5: warning: format '%ld' expects argument of type
  'long int', but argument 3 has type 'int' [-Wformat=]
       err = cn_printf(cn, "%ld", cprm->siginfo->si_signo);
       ^

As si_signo is always an int, the format should be %d here.

Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
---
 fs/coredump.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

Comments

Eric W. Biederman May 15, 2015, 2:54 p.m. UTC | #1
Nicolas Iooss <nicolas.iooss_linux@m4x.org> writes:

> This allows detecting improper format string at build time, like:
>
>   fs/coredump.c:225:5: warning: format '%ld' expects argument of type
>   'long int', but argument 3 has type 'int' [-Wformat=]
>        err = cn_printf(cn, "%ld", cprm->siginfo->si_signo);
>        ^
>
> As si_signo is always an int, the format should be %d here.

Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
>
> Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
> ---
>  fs/coredump.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/fs/coredump.c b/fs/coredump.c
> index 833a57bc856c..e52e0064feac 100644
> --- a/fs/coredump.c
> +++ b/fs/coredump.c
> @@ -70,7 +70,8 @@ static int expand_corename(struct core_name *cn, int size)
>  	return 0;
>  }
>  
> -static int cn_vprintf(struct core_name *cn, const char *fmt, va_list arg)
> +static __printf(2, 0) int cn_vprintf(struct core_name *cn, const char *fmt,
> +				     va_list arg)
>  {
>  	int free, need;
>  	va_list arg_copy;
> @@ -93,7 +94,7 @@ again:
>  	return -ENOMEM;
>  }
>  
> -static int cn_printf(struct core_name *cn, const char *fmt, ...)
> +static __printf(2, 3) int cn_printf(struct core_name *cn, const char *fmt, ...)
>  {
>  	va_list arg;
>  	int ret;
> @@ -105,7 +106,8 @@ static int cn_printf(struct core_name *cn, const char *fmt, ...)
>  	return ret;
>  }
>  
> -static int cn_esc_printf(struct core_name *cn, const char *fmt, ...)
> +static __printf(2, 3)
> +int cn_esc_printf(struct core_name *cn, const char *fmt, ...)
>  {
>  	int cur = cn->used;
>  	va_list arg;
> @@ -225,7 +227,8 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm)
>  				break;
>  			/* signal that caused the coredump */
>  			case 's':
> -				err = cn_printf(cn, "%ld", cprm->siginfo->si_signo);
> +				err = cn_printf(cn, "%d",
> +						cprm->siginfo->si_signo);
>  				break;
>  			/* UNIX time of coredump */
>  			case 't': {
--
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Patch
diff mbox

diff --git a/fs/coredump.c b/fs/coredump.c
index 833a57bc856c..e52e0064feac 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -70,7 +70,8 @@  static int expand_corename(struct core_name *cn, int size)
 	return 0;
 }
 
-static int cn_vprintf(struct core_name *cn, const char *fmt, va_list arg)
+static __printf(2, 0) int cn_vprintf(struct core_name *cn, const char *fmt,
+				     va_list arg)
 {
 	int free, need;
 	va_list arg_copy;
@@ -93,7 +94,7 @@  again:
 	return -ENOMEM;
 }
 
-static int cn_printf(struct core_name *cn, const char *fmt, ...)
+static __printf(2, 3) int cn_printf(struct core_name *cn, const char *fmt, ...)
 {
 	va_list arg;
 	int ret;
@@ -105,7 +106,8 @@  static int cn_printf(struct core_name *cn, const char *fmt, ...)
 	return ret;
 }
 
-static int cn_esc_printf(struct core_name *cn, const char *fmt, ...)
+static __printf(2, 3)
+int cn_esc_printf(struct core_name *cn, const char *fmt, ...)
 {
 	int cur = cn->used;
 	va_list arg;
@@ -225,7 +227,8 @@  static int format_corename(struct core_name *cn, struct coredump_params *cprm)
 				break;
 			/* signal that caused the coredump */
 			case 's':
-				err = cn_printf(cn, "%ld", cprm->siginfo->si_signo);
+				err = cn_printf(cn, "%d",
+						cprm->siginfo->si_signo);
 				break;
 			/* UNIX time of coredump */
 			case 't': {