usbnet: ignore endpoints with invalid wMaxPacketSize

[ Upstream commit 8d3d7c2029c1b360f1a6b0a2fca470b57eb575c0 ]

Endpoints with zero wMaxPacketSize are not usable for transferring
data. Ignore such endpoints when looking for valid in, out and
status pipes, to make the drivers more robust against invalid and
meaningless descriptors.

The wMaxPacketSize of these endpoints are used for memory allocations
and as divisors in many usbnet minidrivers. Avoiding zero is therefore
critical.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 72514c46b4786ae26ba6d16a2c6d32b9a2cfb078..07c00e378a5cdfbd9b62bec5f085b65f32ff3626 100644 (file)
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -100,6 +100,11 @@ int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
                        int                             intr = 0;
 
                        e = alt->endpoint + ep;
+
+                       /* ignore endpoints which cannot transfer data */
+                       if (!usb_endpoint_maxp(&e->desc))
+                               continue;
+
                        switch (e->desc.bmAttributes) {
                        case USB_ENDPOINT_XFER_INT:
                                if (!usb_endpoint_dir_in(&e->desc))