usbnet: ignore endpoints with invalid wMaxPacketSize

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>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index e44849499b89..dde05e2fdc3e 100644
--- 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))