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brcmfmac: fix interface sanity check

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commit 3428fbcd6e upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold
2019-12-10 12:44:22 +01:00
committed by Greg Kroah-Hartman
parent 62f709d299
commit 2c5cb5c8ad
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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@@ -1330,7 +1330,7 @@ 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)) {
@@ -1343,7 +1343,7 @@ 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;