The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From e93cd35101b61e4c79149be2cfc927c4b28dc60c Mon Sep 17 00:00:00 2001

From: Johan Hovold johan@kernel.org Date: Thu, 28 Nov 2019 18:22:00 +0100 Subject: [PATCH] rsi: fix use-after-free on failed probe and unbind

Make sure to stop both URBs before returning after failed probe as well as on disconnect to avoid use-after-free in the completion handler.

Reported-by: syzbot+b563b7f8dbe8223a51e8@syzkaller.appspotmail.com Fixes: a4302bff28e2 ("rsi: add bluetooth rx endpoint") Fixes: dad0d04fa7ba ("rsi: Add RS9113 wireless driver") Cc: stable stable@vger.kernel.org # 3.15 Cc: Siva Rebbagondla siva.rebbagondla@redpinesignals.com Cc: Prameela Rani Garnepudi prameela.j04cs@gmail.com Cc: Amitkumar Karwar amit.karwar@redpinesignals.com Cc: Fariya Fatima fariyaf@gmail.com Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Kalle Valo kvalo@codeaurora.org

diff --git a/drivers/net/wireless/rsi/rsi_91x_usb.c b/drivers/net/wireless/rsi/rsi_91x_usb.c index 53f41fc2cadf..30bed719486e 100644 --- a/drivers/net/wireless/rsi/rsi_91x_usb.c +++ b/drivers/net/wireless/rsi/rsi_91x_usb.c @@ -292,6 +292,15 @@ static void rsi_rx_done_handler(struct urb *urb) dev_kfree_skb(rx_cb->rx_skb); }

+static void rsi_rx_urb_kill(struct rsi_hw *adapter, u8 ep_num) +{ + struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev; + struct rx_usb_ctrl_block *rx_cb = &dev->rx_cb[ep_num - 1]; + struct urb *urb = rx_cb->rx_urb; + + usb_kill_urb(urb); +} + /** * rsi_rx_urb_submit() - This function submits the given URB to the USB stack. * @adapter: Pointer to the adapter structure. @@ -823,10 +832,13 @@ static int rsi_probe(struct usb_interface *pfunction, if (adapter->priv->coex_mode > 1) { status = rsi_rx_urb_submit(adapter, BT_EP); if (status) - goto err1; + goto err_kill_wlan_urb; }

return 0; + +err_kill_wlan_urb: + rsi_rx_urb_kill(adapter, WLAN_EP); err1: rsi_deinit_usb_interface(adapter); err: @@ -857,6 +869,10 @@ static void rsi_disconnect(struct usb_interface *pfunction) adapter->priv->bt_adapter = NULL; }

+ if (adapter->priv->coex_mode > 1) + rsi_rx_urb_kill(adapter, BT_EP); + rsi_rx_urb_kill(adapter, WLAN_EP); + rsi_reset_card(adapter); rsi_deinit_usb_interface(adapter); rsi_91x_deinit(adapter);