linux-kernel - Re: [alternate PATCH] block: fix UUID string buffer length

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Date:	Wed, 5 Oct 2011 14:11:31 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Will Drewry <wad@...omium.org>, Rabin Vincent <rabin@....in>,
	axboe@...nel.dk, linux-kernel@...r.kernel.org
Subject: Re: [alternate PATCH] block: fix UUID string buffer length

On Wed, Oct 05, 2011 at 09:48:30AM -0700, Joe Perches wrote:
> The UUID string buffer is several bytes shorter than what is actually
> required.  Fix it and remove the used once inline part_unpack_uuid,
> use snprintf and printf extension %pU directly.
> 
> Based-on-a-patch-by: Rabin Vincent <rabin@....in>
> cc: Will Drewry <wad@...omium.org>
> Signed-off-by: Joe Perches <joe@...ches.com>
> ---
>  block/genhd.c         |    8 +++++---
>  include/linux/genhd.h |    6 ------
>  2 files changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/block/genhd.c b/block/genhd.c
> index e2f6790..427c955 100644
> --- a/block/genhd.c
> +++ b/block/genhd.c
> @@ -735,7 +735,7 @@ void __init printk_all_partitions(void)
>  		struct hd_struct *part;
>  		char name_buf[BDEVNAME_SIZE];
>  		char devt_buf[BDEVT_SIZE];
> -		u8 uuid[PARTITION_META_INFO_UUIDLTH * 2 + 1];
> +		char uuid[sizeof("12345678-1234-1234-1234-123456789012")];

will following look better.

char uuid [PARTITION_META_INFO_UUIDLTH * 2 + 5]

4 bytes for hyphen and 1 for NULL.

Thanks
Vivek
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