linux-kernel - [PATCH v2 1/2] USB: make to_usb_driver() use container_of

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Message-ID: <2024111339-shaky-goldsmith-b233@gregkh>
Date: Wed, 13 Nov 2024 15:04:40 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-usb@...r.kernel.org
Cc: stern@...land.harvard.edu,
	gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org,
	Johan Hovold <johan@...nel.org>,
	Grant Grundler <grundler@...omium.org>,
	Yajun Deng <yajun.deng@...ux.dev>,
	Oliver Neukum <oneukum@...e.com>,
	Douglas Anderson <dianders@...omium.org>
Subject: [PATCH v2 1/2] USB: make to_usb_driver() use container_of_const()

Turns out that we have some const pointers being passed to
to_usb_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_match_dynamic_id() function as well,
because it can handle a const * to struct usb_driver.

Cc: Johan Hovold <johan@...nel.org>
Cc: Alan Stern <stern@...land.harvard.edu>
Cc: Grant Grundler <grundler@...omium.org>
Cc: Yajun Deng <yajun.deng@...ux.dev>
Cc: Oliver Neukum <oneukum@...e.com>
Cc: Douglas Anderson <dianders@...omium.org>
Cc: linux-usb@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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 ++--
 include/linux/usb.h       | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 9ea955a3d115..bc5c561bdbd5 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -228,7 +228,7 @@ static void usb_free_dynids(struct usb_driver *usb_drv)
 }
 
 static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf,
-							struct usb_driver *drv)
+							const struct usb_driver *drv)
 {
 	struct usb_dynid *dynid;
 
@@ -890,7 +890,7 @@ static int usb_device_match(struct device *dev, const struct device_driver *drv)
 
 	} else if (is_usb_interface(dev)) {
 		struct usb_interface *intf;
-		struct usb_driver *usb_drv;
+		const struct usb_driver *usb_drv;
 		const struct usb_device_id *id;
 
 		/* device drivers never match interfaces */
diff --git a/include/linux/usb.h b/include/linux/usb.h
index b66b1af3e439..7a9e96f9d886 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -1243,7 +1243,7 @@ struct usb_driver {
 	unsigned int disable_hub_initiated_lpm:1;
 	unsigned int soft_unbind:1;
 };
-#define	to_usb_driver(d) container_of(d, struct usb_driver, driver)
+#define	to_usb_driver(d) container_of_const(d, struct usb_driver, driver)
 
 /**
  * struct usb_device_driver - identifies USB device driver to usbcore
-- 
2.47.0