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authorOliver Neukum <oneukum@suse.com>2017-11-23 16:39:52 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-11-28 15:17:48 +0100
commit446f666da9f019ce2ffd03800995487e79a91462 (patch)
treef138858ba2b98b3071bf2a0a86f5fb5be6bed9fe /drivers/usb
parenta7c42106ead7041b99662a125b408deb68a3e6aa (diff)
downloadlinux-446f666da9f019ce2ffd03800995487e79a91462.tar.bz2
USB: usbfs: Filter flags passed in from user space
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>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/core/devio.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 705c573d0257..a3fad4ec9870 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -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))
- return -EINVAL;
+ 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)