USB: Accept bulk endpoints with 1024-byte maxpacket
authorAlan Stern <stern@rowland.harvard.edu>
Thu, 3 May 2018 15:04:48 +0000 (11:04 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 9 May 2018 07:50:23 +0000 (09:50 +0200)
commit1fac4fc6708edbad9c1a98d69958f828eb96144c
tree48a4ae716c726df36f6274fb9f7b60701db03db4
parentddb6f5228e6132c706719561cebf4347b930dbb5
USB: Accept bulk endpoints with 1024-byte maxpacket

commit fb5ee84ea72c5f1b6cabdd1c9d6e8648995ca7c6 upstream.

Some non-compliant high-speed USB devices have bulk endpoints with a
1024-byte maxpacket size.  Although such endpoints don't work with
xHCI host controllers, they do work with EHCI controllers.  We used to
accept these invalid sizes (with a warning), but we no longer do
because of an unintentional change introduced by commit aed9d65ac327
("USB: validate wMaxPacketValue entries in endpoint descriptors").

This patch restores the old behavior, so that people with these
peculiar devices can use them without patching their kernels by hand.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Suggested-by: Elvinas <elvinas@veikia.lt>
Fixes: aed9d65ac327 ("USB: validate wMaxPacketValue entries in endpoint descriptors")
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/core/config.c