From: Bjørn Mork bjorn@mork.no
[ 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 --- drivers/net/usb/usbnet.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -100,6 +100,11 @@ int usbnet_get_endpoints(struct usbnet * 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))