linux-kernel - Re: [PATCH] scripts/mod/modpost.c: Fix bug in number

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Date:	Wed, 25 Jun 2014 10:26:56 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scripts/mod/modpost.c: Fix bug in number_prefix

On 14-06-25 04:46 AM, Rasmus Villemoes wrote:
> The function number_prefix() can currently only return 1 if its
> argument is the empty string: If line 3 is reached and *sym (now the
> second character in the argument) is not '.', 0 is returned. However,
> if that character is '.', the first assignment to c is that same '.',
> which obviously fails to be a digit.

I'd suggest you expand the commit log to actually list the end-user
visible symptom and the use case that this actually fixes, since it
isn't obvious to me at all.

Thanks,
Paul.
--

> 
> Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
> ---
>  scripts/mod/modpost.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 9d9c5b9..336f45f 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -778,9 +778,9 @@ static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
>   */
>  static int number_prefix(const char *sym)
>  {
> -	if (*sym++ == '\0')
> +	if (*sym == '\0')
>  		return 1;
> -	if (*sym != '.')
> +	if (*sym++ != '.')
>  		return 0;
>  	do {
>  		char c = *sym++;
> 
--
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