USB: core: add endpoint-blacklist quirk

commit 73f8bda9b5dc1c69df2bc55c0cbb24461a6391a9 upstream.

Add a new device quirk that can be used to blacklist endpoints.

Since commit 3e4f8e21c4f2 ("USB: core: fix check for duplicate
endpoints") USB core ignores any duplicate endpoints found during
descriptor parsing.

In order to handle devices where the first interfaces with duplicate
endpoints are the ones that should have their endpoints ignored, we need
to add a blacklist.

Tested-by: edes <edes@gmx.net>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20200203153830.26394-2-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
index 0bf0e62..2025261 100644 (file)
--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -256,6 +256,7 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno,
                struct usb_host_interface *ifp, int num_ep,
                unsigned char *buffer, int size)
 {
+       struct usb_device *udev = to_usb_device(ddev);
        unsigned char *buffer0 = buffer;
        struct usb_endpoint_descriptor *d;
        struct usb_host_endpoint *endpoint;
@@ -297,6 +298,16 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno,
                goto skip_to_next_endpoint_or_interface_descriptor;
        }
 
+       /* Ignore blacklisted endpoints */
+       if (udev->quirks & USB_QUIRK_ENDPOINT_BLACKLIST) {
+               if (usb_endpoint_is_blacklisted(udev, ifp, d)) {
+                       dev_warn(ddev, "config %d interface %d altsetting %d has a blacklisted endpoint with address 0x%X, skipping\n",
+                                       cfgno, inum, asnum,
+                                       d->bEndpointAddress);
+                       goto skip_to_next_endpoint_or_interface_descriptor;
+               }
+       }
+
        endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints];
        ++ifp->desc.bNumEndpoints;
 

diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
index 6b64130..56c8dff 100644 (file)
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -472,6 +472,38 @@ static const struct usb_device_id usb_amd_resume_quirk_list[] = {
        { }  /* terminating entry must be last */
 };
 
+/*
+ * Entries for blacklisted endpoints that should be ignored when parsing
+ * configuration descriptors.
+ *
+ * Matched for devices with USB_QUIRK_ENDPOINT_BLACKLIST.
+ */
+static const struct usb_device_id usb_endpoint_blacklist[] = {
+       { }
+};
+
+bool usb_endpoint_is_blacklisted(struct usb_device *udev,
+               struct usb_host_interface *intf,
+               struct usb_endpoint_descriptor *epd)
+{
+       const struct usb_device_id *id;
+       unsigned int address;
+
+       for (id = usb_endpoint_blacklist; id->match_flags; ++id) {
+               if (!usb_match_device(udev, id))
+                       continue;
+
+               if (!usb_match_one_id_intf(udev, intf, id))
+                       continue;
+
+               address = id->driver_info;
+               if (address == epd->bEndpointAddress)
+                       return true;
+       }
+
+       return false;
+}
+
 static bool usb_match_any_interface(struct usb_device *udev,
                                    const struct usb_device_id *id)
 {

diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index d95a535..c0df5a4 100644 (file)
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -37,6 +37,9 @@ extern void usb_authorize_interface(struct usb_interface *);
 extern void usb_detect_quirks(struct usb_device *udev);
 extern void usb_detect_interface_quirks(struct usb_device *udev);
 extern void usb_release_quirk_list(void);
+extern bool usb_endpoint_is_blacklisted(struct usb_device *udev,
+               struct usb_host_interface *intf,
+               struct usb_endpoint_descriptor *epd);
 extern int usb_remove_device(struct usb_device *udev);
 
 extern int usb_get_device_descriptor(struct usb_device *dev,

diff --git a/include/linux/usb/quirks.h b/include/linux/usb/quirks.h
index a1be64c..22c1f57 100644 (file)
--- a/include/linux/usb/quirks.h
+++ b/include/linux/usb/quirks.h
@@ -69,4 +69,7 @@
 /* Hub needs extra delay after resetting its port. */
 #define USB_QUIRK_HUB_SLOW_RESET               BIT(14)
 
+/* device has blacklisted endpoints */
+#define USB_QUIRK_ENDPOINT_BLACKLIST           BIT(15)
+
 #endif /* __LINUX_USB_QUIRKS_H */