Re: [PATCH] quota: Detect loops in quota tree

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On Mon 12-02-24 10:47:28, Kees Cook wrote:
> On Fri, Feb 09, 2024 at 12:22:50PM +0100, Jan Kara wrote:
> > [...]
> > @@ -613,15 +658,17 @@ static loff_t find_block_dqentry(struct qtree_mem_dqinfo *info,
> >  
> >  /* Find entry for given id in the tree */
> >  static loff_t find_tree_dqentry(struct qtree_mem_dqinfo *info,
> > -				struct dquot *dquot, uint blk, int depth)
> > +				struct dquot *dquot, uint *blks, int depth)
> >  {
> >  	char *buf = kmalloc(info->dqi_usable_bs, GFP_NOFS);
> >  	loff_t ret = 0;
> >  	__le32 *ref = (__le32 *)buf;
> > +	uint blk;
> > +	int i;
> >  
> >  	if (!buf)
> >  		return -ENOMEM;
> > -	ret = read_blk(info, blk, buf);
> > +	ret = read_blk(info, blks[depth], buf);
> >  	if (ret < 0) {
> >  		quota_error(dquot->dq_sb, "Can't read quota tree block %u",
> >  			    blk);
>                             ^^^
> Coverity noticed this is used uninitialized. It should be "blks[depth]"
> now, I think.

Yup, already pushed fix to my tree as 0-day notified me as well :) But
thanks for noticing!

								Honza
-- 
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR




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