| Message ID | 2024111342-lagoon-reapprove-5e49@gregkh (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | d6fa15bbcf9604e3c14816410550d2cf22b955e4 |
| Headers | show |
| Series | [v2,1/2] USB: make to_usb_driver() use container_of_const() | expand |
Hi, On Wed, Nov 13, 2024 at 6:04 AM Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote: > > Turns out that we have some const pointers being passed to > to_usb_device_driver() but were not catching this. Change the macro to > properly propagate the const-ness of the pointer so that we will notice > when we try to write to memory that we shouldn't be writing to. > > This requires fixing up the usb_driver_applicable() function as well, > because it can handle a const * to struct usb_driver. > > Cc: Johan Hovold <johan@kernel.org> > Cc: Alan Stern <stern@rowland.harvard.edu> > Cc: Grant Grundler <grundler@chromium.org> > Cc: Yajun Deng <yajun.deng@linux.dev> > Cc: Oliver Neukum <oneukum@suse.com> > Cc: Douglas Anderson <dianders@chromium.org> > Cc: linux-usb@vger.kernel.org > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > --- > v2: reordered patches, goes on top of series submitted at https://lore.kernel.org/r/2024111322-kindly-finalist-d247@gregkh > > drivers/usb/core/driver.c | 4 ++-- > drivers/usb/core/usb.h | 2 +- > include/linux/usb.h | 3 +-- > 3 files changed, 4 insertions(+), 5 deletions(-) This looks reasonable to me. Assuming that there are no compiler errors reported: Reviewed-by: Douglas Anderson <dianders@chromium.org>
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index bc5c561bdbd5..f203fdbfb6f6 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -850,7 +850,7 @@ const struct usb_device_id *usb_device_match_id(struct usb_device *udev, EXPORT_SYMBOL_GPL(usb_device_match_id); bool usb_driver_applicable(struct usb_device *udev, - struct usb_device_driver *udrv) + const struct usb_device_driver *udrv) { if (udrv->id_table && udrv->match) return usb_device_match_id(udev, udrv->id_table) != NULL && @@ -870,7 +870,7 @@ static int usb_device_match(struct device *dev, const struct device_driver *drv) /* devices and interfaces are handled separately */ if (is_usb_device(dev)) { struct usb_device *udev; - struct usb_device_driver *udrv; + const struct usb_device_driver *udrv; /* interface drivers never match devices */ if (!is_usb_device_driver(drv)) diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h index b8324ea05b20..a9b37aeb515b 100644 --- a/drivers/usb/core/usb.h +++ b/drivers/usb/core/usb.h @@ -75,7 +75,7 @@ extern int usb_match_device(struct usb_device *dev, extern const struct usb_device_id *usb_device_match_id(struct usb_device *udev, const struct usb_device_id *id); extern bool usb_driver_applicable(struct usb_device *udev, - struct usb_device_driver *udrv); + const struct usb_device_driver *udrv); extern void usb_forced_unbind_intf(struct usb_interface *intf); extern void usb_unbind_and_rebind_marked_interfaces(struct usb_device *udev); diff --git a/include/linux/usb.h b/include/linux/usb.h index 7a9e96f9d886..cfa8005e24f9 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -1294,8 +1294,7 @@ struct usb_device_driver { unsigned int supports_autosuspend:1; unsigned int generic_subclass:1; }; -#define to_usb_device_driver(d) container_of(d, struct usb_device_driver, \ - driver) +#define to_usb_device_driver(d) container_of_const(d, struct usb_device_driver, driver) /** * struct usb_class_driver - identifies a USB driver that wants to use the USB major number
Turns out that we have some const pointers being passed to to_usb_device_driver() but were not catching this. Change the macro to properly propagate the const-ness of the pointer so that we will notice when we try to write to memory that we shouldn't be writing to. This requires fixing up the usb_driver_applicable() function as well, because it can handle a const * to struct usb_driver. Cc: Johan Hovold <johan@kernel.org> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Grant Grundler <grundler@chromium.org> Cc: Yajun Deng <yajun.deng@linux.dev> Cc: Oliver Neukum <oneukum@suse.com> Cc: Douglas Anderson <dianders@chromium.org> Cc: linux-usb@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- v2: reordered patches, goes on top of series submitted at https://lore.kernel.org/r/2024111322-kindly-finalist-d247@gregkh drivers/usb/core/driver.c | 4 ++-- drivers/usb/core/usb.h | 2 +- include/linux/usb.h | 3 +-- 3 files changed, 4 insertions(+), 5 deletions(-)