linux-ext4 - Re: [PATCH] e2image: fix invalid lseek error detection

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Date:	Wed, 14 Sep 2011 18:00:34 +0200 (CEST)
From:	Lukas Czerner <lczerner@...hat.com>
To:	Eric Sandeen <sandeen@...hat.com>
cc:	Lukas Czerner <lczerner@...hat.com>, linux-ext4@...r.kernel.org,
	tytso@....edu
Subject: Re: [PATCH] e2image: fix invalid lseek error detection

On Wed, 24 Aug 2011, Eric Sandeen wrote:

> On 8/24/11 3:00 AM, Lukas Czerner wrote:
> > In flush_l2_cache() we are using ext2fs_llseek() however we do not
> > properly detect the error code returned from the function, because we
> > are assigning it into ULL variable, hence we will not see negative
> > values.
> > 
> > Fix this by changing the type of the variable to ext2_loff_t which is
> > signed and hence will store negative values.
> > 
> > Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> 
> Yup!
> 
> Reviewed-by: Eric Sandeen <sandeen@...hat.com>

ping

> 
> > ---
> >  misc/e2image.c |    3 ++-
> >  1 files changed, 2 insertions(+), 1 deletions(-)
> > 
> > diff --git a/misc/e2image.c b/misc/e2image.c
> > index 83a9d02..bf0c0d4 100644
> > --- a/misc/e2image.c
> > +++ b/misc/e2image.c
> > @@ -759,7 +759,8 @@ static void put_used_table(struct ext2_qcow2_image *img,
> >  
> >  static void flush_l2_cache(struct ext2_qcow2_image *image)
> >  {
> > -	blk64_t offset, seek = 0;
> > +	blk64_t seek = 0;
> > +	ext2_loff_t offset;
> >  	struct ext2_qcow2_l2_cache *cache = image->l2_cache;
> >  	struct ext2_qcow2_l2_table *table = cache->used_head;
> >  	int fd = image->fd;
> 
> 

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