[PATCH 4.9 084/102] staging: wlan-ng: fix use-after-free Read in hfa384x_usbin_callback

[Greg Kroah-Hartman]

From: Qiujun Huang <hqjagain@xxxxxxxxx>

commit 1165dd73e811a07d947aee218510571f516081f6 upstream.

We can't handle the case length > WLAN_DATA_MAXLEN.
Because the size of rxfrm->data is WLAN_DATA_MAXLEN(2312), and we can't
read more than that.

Thanks-to: Hillf Danton <hdanton@xxxxxxxx>
Reported-and-tested-by: syzbot+7d42d68643a35f71ac8a@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Qiujun Huang <hqjagain@xxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200326131850.17711-1-hqjagain@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/staging/wlan-ng/hfa384x_usb.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/staging/wlan-ng/hfa384x_usb.c
+++ b/drivers/staging/wlan-ng/hfa384x_usb.c
@@ -3443,6 +3443,8 @@ static void hfa384x_int_rxmonitor(struct
 	     WLAN_HDR_A4_LEN + WLAN_DATA_MAXLEN + WLAN_CRC_LEN)) {
 		pr_debug("overlen frm: len=%zd\n",
 			 skblen - sizeof(struct p80211_caphdr));
+
+		return;
 	}
 
 	skb = dev_alloc_skb(skblen);