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staging: wlan-ng: fix out of bounds read in prism2sta_probe_usb()

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let's use usb_find_common_endpoints() to discover endpoints, it does all
necessary checks for type and xfer direction

remove memset() in hfa384x_create(), because we now assign endpoints in
prism2sta_probe_usb() and because create_wlan() uses kzalloc() to
allocate hfa384x struct before calling hfa384x_create()

Fixes: faaff97656 ("staging: wlan-ng: properly check endpoint types")
Reported-and-tested-by: syzbot+22794221ab96b0bab53a@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=22794221ab96b0bab53a
Signed-off-by: Rustam Kovhaev <rkovhaev@gmail.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200804145614.104320-1-rkovhaev@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rustam Kovhaev 2020-08-04 07:56:14 -07:00 committed by Greg Kroah-Hartman
parent b15b4da88b
commit fea22e159d
2 changed files with 6 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/staging/wlan-ng/hfa384x_usb.c
View File

@ -524,13 +524,8 @@ static void hfa384x_usb_defer(struct work_struct *data)
*/
void hfa384x_create(struct hfa384x *hw, struct usb_device *usb)
{
memset(hw, 0, sizeof(*hw));
hw->usb = usb;
/* set up the endpoints */
hw->endp_in = usb_rcvbulkpipe(usb, 1);
hw->endp_out = usb_sndbulkpipe(usb, 2);
/* Set up the waitq */
init_waitqueue_head(&hw->cmdq);

19
drivers/staging/wlan-ng/prism2usb.c
View File

@ -61,23 +61,14 @@ static int prism2sta_probe_usb(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_device *dev;
const struct usb_endpoint_descriptor *epd;
const struct usb_host_interface *iface_desc = interface->cur_altsetting;
struct usb_endpoint_descriptor *bulk_in, *bulk_out;
struct usb_host_interface *iface_desc = interface->cur_altsetting;
struct wlandevice *wlandev = NULL;
struct hfa384x *hw = NULL;
int result = 0;
if (iface_desc->desc.bNumEndpoints != 2) {
result = -ENODEV;
goto failed;
}
result = -EINVAL;
epd = &iface_desc->endpoint[1].desc;
if (!usb_endpoint_is_bulk_in(epd))
goto failed;
epd = &iface_desc->endpoint[2].desc;
if (!usb_endpoint_is_bulk_out(epd))
result = usb_find_common_endpoints(iface_desc, &bulk_in, &bulk_out, NULL, NULL);
if (result)
goto failed;
dev = interface_to_usbdev(interface);
@ -96,6 +87,8 @@ static int prism2sta_probe_usb(struct usb_interface *interface,
}
/* Initialize the hw data */
hw->endp_in = usb_rcvbulkpipe(dev, bulk_in->bEndpointAddress);
hw->endp_out = usb_sndbulkpipe(dev, bulk_out->bEndpointAddress);
hfa384x_create(hw, dev);
hw->wlandev = wlandev;