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

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Message-ID: <1317838695.1782.43.camel@Joe-Laptop>
Date:	Wed, 05 Oct 2011 11:18:15 -0700
From:	Joe Perches <joe@...ches.com>
To:	Vivek Goyal <vgoyal@...hat.com>, Huang Ying <ying.huang@...el.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, 2011-10-05 at 14:11 -0400, Vivek Goyal wrote:
> 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.

Perhaps include/linux/uuid.h could be extended to provide
some #defines for the various UUID lengths.
 


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