linux-kernel - Re: [PATCH] UDF: possible usage of uninitialized variables

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Date:	Wed, 23 May 2007 20:05:33 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] UDF: possible usage of uninitialized variables

[Jan Kara - Tue, May 22, 2007 at 10:29:38PM +0200]
| > A few variables could be used without being explicitly initialized.
| > Fixed.
| > 
| > Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
| > ---
| > 
| > 
| >  balloc.c |    6 +++++-
| >  super.c  |    5 ++++-
| >  2 files changed, 9 insertions(+), 2 deletions(-)
| > 
| > 
| > diff --git a/balloc.c b/balloc.c
| > index 4cec910..be37393 100644
| > --- a/balloc.c
| > +++ b/balloc.c
| > @@ -744,7 +744,11 @@ static int udf_table_new_block(struct super_block * sb,
| >  	uint32_t spread = 0xFFFFFFFF, nspread = 0xFFFFFFFF;
| >  	uint32_t newblock = 0, adsize;
| >  	uint32_t elen, goal_elen = 0;
| > -	kernel_lb_addr eloc, goal_eloc;
| > +	kernel_lb_addr eloc;
| > +	kernel_lb_addr goal_eloc = {
| > +		.logicalBlockNum = 0,
| > +		.partitionReferenceNum = 0,
| > +	};
| >  	struct extent_position epos, goal_epos;
| >  	int8_t etype;
|   As I read the code, I don't think it can happen goal_eloc is used
| unitialized. Also please diff the tree completely, not just the udf
| directory..
| 
| > diff --git a/super.c b/super.c
| > index 9b8644a..068a99c 100644
| > --- a/super.c
| > +++ b/super.c
| > @@ -1358,7 +1358,10 @@ udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
| >  			case UDF_VIRTUAL_MAP15:
| >  			case UDF_VIRTUAL_MAP20:
| >  			{
| > -				kernel_lb_addr ino;
| > +				kernel_lb_addr ino = {
| > +					.logicalBlockNum = 0,
| > +					.partitionReferenceNum = 0,
| > +				};
| >  
| >  				if (!UDF_SB_LASTBLOCK(sb))
| >  				{
|   This one seems correct. Thanks for fixing this.
| 
| 								Honza
| -- 
| Jan Kara <jack@...e.cz>
| SuSE CR Labs
| 

Jan, you know I've been messed up. The variables I've touched in my patch
became initialized in any case.

Andrew, just drop my patch (you're right and I was wrong ;).

Thanks you both for comments.

		Cyrill

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