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

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Date:	Wed, 5 Oct 2011 14:24:11 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Huang Ying <ying.huang@...el.com>, 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 11:18:15AM -0700, Joe Perches wrote:
> 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.

That would be best. So that everybody uses a common define.

Thanks
Vivek
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