linux-kernel - Re: [PATCH] arch: blackfin: kernel: sprintf(), need avoid NUL for '%s'

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Message-ID: <CAMjpGUf6rvcjNVqk6bB4RRjOSLQjk3de6CEv7rUm3VcMhzGdag@mail.gmail.com>
Date:	Sat, 15 Jun 2013 23:02:28 -0400
From:	Mike Frysinger <vapier@...too.org>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	anton.vorontsov@...aro.org, Richard Kuo <rkuo@...eaurora.org>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	"uclinux-dist-devel@...ckfin.uclinux.org" 
	<uclinux-dist-devel@...ckfin.uclinux.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] arch: blackfin: kernel: sprintf(), need avoid NUL for '%s'

i think you mean NULL instead of NUL

that said, the kernel is smart enough to replace NULL with "(null)",
so i don't see much point in this patch
-mike

On Wed, May 29, 2013 at 5:43 AM, Chen Gang <gang.chen@...anux.com> wrote:
>
> When it is kernel symbol, the 'modname' will be NUL, and the 'symname'
> contents the valid name.
>
> So for sprintf(), need avoid NUL for '%s'.
>
>
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  arch/blackfin/kernel/trace.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/arch/blackfin/kernel/trace.c b/arch/blackfin/kernel/trace.c
> index c36efa0..11f98bb 100644
> --- a/arch/blackfin/kernel/trace.c
> +++ b/arch/blackfin/kernel/trace.c
> @@ -51,7 +51,7 @@ void decode_address(char *buf, unsigned long address)
>                 if (!modname)
>                         modname = delim = "";
>                 sprintf(buf, "{ %s%s%s%s + 0x%lx }",
> -                       delim, modname, delim, symname,
> +                       delim, modname ? : "kernel", delim, symname,
>                         (unsigned long)offset);
>                 return;
>         }
> --
> 1.7.7.6
> --
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