patch "staging: wlan-ng: fix use-after-free Read in hfa384x_usbin_callback" added to staging-testing

patch "staging: wlan-ng: fix use-after-free Read in hfa384x_usbin_callback" added to staging-testing

[gregkh]

This is a note to let you know that I've just added the patch titled

    staging: wlan-ng: fix use-after-free Read in hfa384x_usbin_callback

to my staging git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-testing branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will be merged to the staging-next branch sometime soon,
after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.


From 1165dd73e811a07d947aee218510571f516081f6 Mon Sep 17 00:00:00 2001
From: Qiujun Huang <hqjagain@gmail.com>
Date: Thu, 26 Mar 2020 21:18:50 +0800
Subject: staging: wlan-ng: fix use-after-free Read in hfa384x_usbin_callback

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@sina.com>
Reported-and-tested-by: syzbot+7d42d68643a35f71ac8a@syzkaller.appspotmail.com
Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200326131850.17711-1-hqjagain@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/staging/wlan-ng/hfa384x_usb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/wlan-ng/hfa384x_usb.c b/drivers/staging/wlan-ng/hfa384x_usb.c
index e38acb58cd5e..fa1bf8b069fd 100644
--- a/drivers/staging/wlan-ng/hfa384x_usb.c
+++ b/drivers/staging/wlan-ng/hfa384x_usb.c
@@ -3376,6 +3376,8 @@ static void hfa384x_int_rxmonitor(struct wlandevice *wlandev,
 	     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);
-- 
2.26.0