This is a note to let you know that I've just added the patch titled
USB: fix the usbfs flag sanitization for control transfers
to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 665c365a77fbfeabe52694aedf3446d5f2f1ce42 Mon Sep 17 00:00:00 2001
From: Alan Stern stern@rowland.harvard.edu Date: Mon, 15 Oct 2018 16:55:04 -0400 Subject: USB: fix the usbfs flag sanitization for control transfers
Commit 7a68d9fb8510 ("USB: usbdevfs: sanitize flags more") checks the transfer flags for URBs submitted from userspace via usbfs. However, the check for whether the USBDEVFS_URB_SHORT_NOT_OK flag should be allowed for a control transfer was added in the wrong place, before the code has properly determined the direction of the control transfer. (Control transfers are special because for them, the direction is set by the bRequestType byte of the Setup packet rather than direction bit of the endpoint address.)
This patch moves code which sets up the allow_short flag for control transfers down after is_in has been set to the correct value.
Signed-off-by: Alan Stern stern@rowland.harvard.edu Reported-and-tested-by: syzbot+24a30223a4b609bb802e@syzkaller.appspotmail.com Fixes: 7a68d9fb8510 ("USB: usbdevfs: sanitize flags more") CC: Oliver Neukum oneukum@suse.com CC: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/core/devio.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index 244417d0dfd1..ffccd40ea67d 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -1474,8 +1474,6 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb u = 0; switch (uurb->type) { case USBDEVFS_URB_TYPE_CONTROL: - if (is_in) - allow_short = true; if (!usb_endpoint_xfer_control(&ep->desc)) return -EINVAL; /* min 8 byte setup packet */ @@ -1505,6 +1503,8 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb is_in = 0; uurb->endpoint &= ~USB_DIR_IN; } + if (is_in) + allow_short = true; snoop(&ps->dev->dev, "control urb: bRequestType=%02x " "bRequest=%02x wValue=%04x " "wIndex=%04x wLength=%04x\n",