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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>
This commit is contained in:
Nicolas Iooss 2015-06-25 15:03:53 -07:00 committed by Linus Torvalds
parent 5202efe544
commit b4176b7c13
1 changed files with 7 additions and 4 deletions
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11
fs/coredump.c
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@ -70,7 +70,8 @@ static int expand_corename(struct core_name *cn, int size)
return 0; 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; int free, need;
va_list arg_copy; va_list arg_copy;
@ -93,7 +94,7 @@ again:
return -ENOMEM; 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; va_list arg;
int ret; int ret;
@ -105,7 +106,8 @@ static int cn_printf(struct core_name *cn, const char *fmt, ...)
return ret; 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; int cur = cn->used;
va_list arg; va_list arg;
@ -225,7 +227,8 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm)
break; break;
/* signal that caused the coredump */ /* signal that caused the coredump */
case 's': case 's':
err = cn_printf(cn, "%ld", cprm->siginfo->si_signo); err = cn_printf(cn, "%d",
cprm->siginfo->si_signo);
break; break;
/* UNIX time of coredump */ /* UNIX time of coredump */
case 't': { case 't': {