coredump: add __printf attribute to cn_*printf functions
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>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/coredump.c b/fs/coredump.c
index 833a57b..e52e006 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -70,7 +70,8 @@
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 @@
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 @@
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 @@
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': {