[PATCH] xfs: fix a memory leak in xfs_get_acl on error

[Mateusz Guzik]

On Thu, Mar 31, 2016 at 07:26:55AM +1100, Dave Chinner wrote:
> On Wed, Mar 30, 2016 at 04:35:07PM +0200, Mateusz Guzik wrote:
> > Signed-off-by: Mateusz Guzik <mguzik at redhat.com>
> > ---
> >  fs/xfs/xfs_acl.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
> > index 2dad2b5..ce10c4c 100644
> > --- a/fs/xfs/xfs_acl.c
> > +++ b/fs/xfs/xfs_acl.c
> > @@ -162,10 +162,11 @@ xfs_get_acl(struct inode *inode, int type)
> >  		 */
> >  		if (error != -ENOATTR)
> >  			acl = ERR_PTR(error);
> > -		return acl;
> > +		goto out;
> >  	}
> >  
> >  	acl = xfs_acl_from_disk(xfs_acl, len, XFS_ACL_MAX_ENTRIES(ip->i_mount));
> > +out:
> >  	kmem_free(xfs_acl);
> >  	return acl;
> >  }
> 
> Hi Mateusz,
> 
> It looks like we've already fixed this problem - can you check
> 4.6-rc1 and if the leak is still there post an updated patch?
> 

The patch which introuced the bug is not present in 4.6-rc1.

The patch is against next-20160330, the bug was introduced in:

commit ae4e84be32ef6fdf97f10852778597b1a2be3cba
Author: Andreas Gruenbacher <agruenba at redhat.com>
Date:   Thu Mar 24 14:38:37 2016 +0100

    posix_acl: Inode acl caching fixes

Apologies if this should have been handled differently (by replying to the
original patch?)

-- 
Mateusz Guzik