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>
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@ -100,6 +100,11 @@ int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
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int intr = 0;
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e = alt->endpoint + ep;
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/* ignore endpoints which cannot transfer data */
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if (!usb_endpoint_maxp(&e->desc))
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continue;
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switch (e->desc.bmAttributes) {
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case USB_ENDPOINT_XFER_INT:
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if (!usb_endpoint_dir_in(&e->desc))
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