On Tue, Aug 22, 2023 at 11:39:12PM +0200, Vitaly Kuzmichev wrote:
> Fix comparison of two identical UUID strings ending with dash '-'.
>
> In this case grub_uuidcasecmp() passes through the null terminators
> and actual result depends on whatever garbage follows them.
>
> So break immediately when it reaches the end in any of the strings
> after a dash character '-'.
>
> Signed-off-by: Vitaly Kuzmichev <vitaly.kuzmic...@rtsoft.de>
> ---
> include/grub/misc.h | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/include/grub/misc.h b/include/grub/misc.h
> index 1b35a167f..12fade5de 100644
> --- a/include/grub/misc.h
> +++ b/include/grub/misc.h
> @@ -264,7 +264,8 @@ grub_uuidcasecmp (const char *uuid1, const char *uuid2,
> grub_size_t n)
> while ('-' == *uuid2)
> ++uuid2;
>
> - if (grub_tolower ((grub_uint8_t) *uuid1) != grub_tolower
> ((grub_uint8_t) *uuid2))
> + if (!*uuid1 || !*uuid2 ||
I prefer
if (*uuid1 != '\0' || *uuid2 != '\0' || ...
... if it is what you meant...
If you are OK with that change you get Reviewed-by: Daniel Kiper
<daniel.ki...@oracle.com>...
> + grub_tolower ((grub_uint8_t) *uuid1) != grub_tolower ((grub_uint8_t)
> *uuid2))
> break;
Daniel
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