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USB: usbfs: Filter flags passed in from user space

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USBDEVFS_URB_ISO_ASAP must be accepted only for ISO endpoints.
Improve sanity checking.

Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum 2017-11-23 16:39:52 +01:00 committed by Greg Kroah-Hartman
parent a7c42106ea
commit 446f666da9
1 changed files with 9 additions and 5 deletions
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12
drivers/usb/core/devio.c
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@ -1442,14 +1442,18 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb
int number_of_packets = 0;
unsigned int stream_id = 0;
void *buf;
if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
USBDEVFS_URB_SHORT_NOT_OK |
unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
USBDEVFS_URB_BULK_CONTINUATION |
USBDEVFS_URB_NO_FSBR |
USBDEVFS_URB_ZERO_PACKET |
USBDEVFS_URB_NO_INTERRUPT))
USBDEVFS_URB_NO_INTERRUPT;
/* USBDEVFS_URB_ISO_ASAP is a special case */
if (uurb->type == USBDEVFS_URB_TYPE_ISO)
mask |= USBDEVFS_URB_ISO_ASAP;
if (uurb->flags & ~mask)
return -EINVAL;
if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
return -EINVAL;
if (uurb->buffer_length > 0 && !uurb->buffer)