tree 9ed0866f08f3bdc29b5ceb3b1eba42f2bab25953
parent 0022f009e0cb75e9a78641710277066d91f5f552
author Bjørn Mork <bjorn@mork.no> 1568809058 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1570271414 +0200

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>