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rtl8xxxu: fix interface sanity check 

commit 39a4281c31 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: 26f1fad29a ("New driver: rtl8xxxu (mac80211)")
Cc: stable <stable@vger.kernel.org>     # 4.4
Cc: Jes Sorensen <Jes.Sorensen@redhat.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>
5.4-rM2-2.2.x-imx-squashed
Johan Hovold 2019-12-10 12:44:24 +01:00 committed by Greg Kroah-Hartman
parent 670a39aeb0
commit 226ed25115
1 changed files with 1 additions and 1 deletions
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drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
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@ -5915,7 +5915,7 @@ static int rtl8xxxu_parse_usb(struct rtl8xxxu_priv *priv,
u8 dir, xtype, num;
int ret = 0;
host_interface = &interface->altsetting[0];
host_interface = interface->cur_altsetting;
interface_desc = &host_interface->desc;
endpoints = interface_desc->bNumEndpoints;