lkml.org 
[lkml]   [2016]   [Nov]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH net 2/4] net: ethernet: ti: cpsw: fix device and of_node leaks
On Tue, Nov 01, 2016 at 12:27:11PM -0400, David Miller wrote:
> From: Johan Hovold <johan@kernel.org>
> Date: Tue, 1 Nov 2016 12:03:35 +0100
>
> > diff --git a/drivers/net/ethernet/ti/cpsw-phy-sel.c b/drivers/net/ethernet/ti/cpsw-phy-sel.c
> > index 054a8dd23dae..589beb843f56 100644
> > --- a/drivers/net/ethernet/ti/cpsw-phy-sel.c
> > +++ b/drivers/net/ethernet/ti/cpsw-phy-sel.c
> > @@ -176,8 +176,11 @@ void cpsw_phy_sel(struct device *dev, phy_interface_t phy_mode, int slave)
> > }
> >
> > dev = bus_find_device(&platform_bus_type, NULL, node, match);
> > + of_node_put(node);
> > priv = dev_get_drvdata(dev);
> >
> > + put_device(dev);
> > +
> > priv->cpsw_phy_sel(priv, phy_mode, slave);
> > }
> > EXPORT_SYMBOL_GPL(cpsw_phy_sel);
>
> The only reference you have to 'dev' is the one obtained from the
> bus_find_device() call, therefore you must at least hold onto
> 'dev' until after the priv->cpsw_phy_sel(priv, phy_mode, slave); call.

As I mentioned in the commit message "...there is no guarantee that the
devres-managed struct cpsw_phy_sel_priv will continue to be valid until
this function returns regardless of this change".

Specifically, holding a reference to dev does not prevent the
cpsw_phy_sel driver from being unbound and priv from being freed.

Thanks,
Johan

\
 
 \ /
  Last update: 2016-11-01 17:42    [W:0.078 / U:2.120 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site