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brcmfmac: fix interface sanity check

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Make sure to use the current alternate setting when verifying the
interface descriptors to avoid binding to an invalid interface.

Failing to do so could cause the driver to misbehave or trigger a WARN()
in usb_submit_urb() that kernels with panic_on_warn set would choke on.

Fixes: 71bb244ba2 ("brcm80211: fmac: add USB support for bcm43235/6/8 chipsets")
Cc: stable <stable@vger.kernel.org>     # 3.4
Cc: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Johan Hovold 2019-12-10 12:44:22 +01:00 committed by Kalle Valo
parent af615abd15
commit 3428fbcd6e
1 changed files with 2 additions and 2 deletions
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4
drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c
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@ -1348,7 +1348,7 @@ brcmf_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
goto fail;
}
desc = &intf->altsetting[0].desc;
desc = &intf->cur_altsetting->desc;
if ((desc->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
(desc->bInterfaceSubClass != 2) ||
(desc->bInterfaceProtocol != 0xff)) {
@ -1361,7 +1361,7 @@ brcmf_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
num_of_eps = desc->bNumEndpoints;
for (ep = 0; ep < num_of_eps; ep++) {
endpoint = &intf->altsetting[0].endpoint[ep].desc;
endpoint = &intf->cur_altsetting->endpoint[ep].desc;
endpoint_num = usb_endpoint_num(endpoint);
if (!usb_endpoint_xfer_bulk(endpoint))
continue;