[PATCH 4.19 013/211] usbnet: ignore endpoints with invalid wMaxPacketSize

From: Greg Kroah-Hartman
Date: Thu Oct 03 2019 - 13:27:29 EST


From: BjÃrn Mork <bjorn@xxxxxxx>

[ 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: BjÃrn Mork <bjorn@xxxxxxx>
Signed-off-by: Jakub Kicinski <jakub.kicinski@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/usb/usbnet.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -112,6 +112,11 @@ 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))