| Message ID | 20230609062932.3276509-1-haotienh@nvidia.com |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | [v3] phy: tegra: xusb: Clear the driver reference in usb-phy dev | expand |
Hi Vinod, On 09/06/2023 07:29, Haotien Hsu wrote: > From: EJ Hsu <ejh@nvidia.com> > > For the dual-role port, it will assign the phy dev to usb-phy dev and > use the port dev driver as the dev driver of usb-phy. > > When we try to destroy the port dev, it will destroy its dev driver > as well. But we did not remove the reference from usb-phy dev. This > might cause the use-after-free issue in KASAN. > > Fixes: e8f7d2f409a1 ("phy: tegra: xusb: Add usb-phy support") > Cc: stable@vger.kernel.org > > Signed-off-by: EJ Hsu <ejh@nvidia.com> > Signed-off-by: Haotien Hsu <haotienh@nvidia.com> > Acked-by: Thierry Reding <treding@nvidia.com> > Acked-by: Jon Hunter <jonathanh@nvidia.com> > --- > V1 -> V2: Remove extra movements to clarify the change > V2 -> V3: Update patch title > --- > drivers/phy/tegra/xusb.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c > index 78045bd6c214..26b66a668f3b 100644 > --- a/drivers/phy/tegra/xusb.c > +++ b/drivers/phy/tegra/xusb.c > @@ -568,6 +568,7 @@ static void tegra_xusb_port_unregister(struct tegra_xusb_port *port) > usb_role_switch_unregister(port->usb_role_sw); > cancel_work_sync(&port->usb_phy_work); > usb_remove_phy(&port->usb_phy); > + port->usb_phy.dev->driver = NULL; > } > > if (port->ops->remove) OK to pick this up now? Thanks Jon
On 09-06-23, 14:29, Haotien Hsu wrote: > From: EJ Hsu <ejh@nvidia.com> > > For the dual-role port, it will assign the phy dev to usb-phy dev and > use the port dev driver as the dev driver of usb-phy. > > When we try to destroy the port dev, it will destroy its dev driver > as well. But we did not remove the reference from usb-phy dev. This > might cause the use-after-free issue in KASAN. Applied, thanks
diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c index 78045bd6c214..26b66a668f3b 100644 --- a/drivers/phy/tegra/xusb.c +++ b/drivers/phy/tegra/xusb.c @@ -568,6 +568,7 @@ static void tegra_xusb_port_unregister(struct tegra_xusb_port *port) usb_role_switch_unregister(port->usb_role_sw); cancel_work_sync(&port->usb_phy_work); usb_remove_phy(&port->usb_phy); + port->usb_phy.dev->driver = NULL; } if (port->ops->remove)